Subhasish Mandal, an assistant professor in the WVU Eberly College of Arts and Sciences Department of Physics and Astronomy, has been awarded a Faculty Early Career Development Program award from the U.S. National Science Foundation. The CAREER award, widely regarded as the foundation’s most prestigious honor for early-career faculty, recognizes researchers who demonstrate the potential to serve as academic role models while integrating research and education. For Mandal, the support will fuel an ambitious computational program aimed at understanding how the inner workings of exotic materials give rise to stable quantum behavior — and at building the free software tools that could allow scientists everywhere to accelerate the search for the materials that future quantum technologies will demand.

The core challenge that Mandal’s project addresses lies in the fundamental difference between ordinary and quantum information. Classical computers process information in bits, which exist strictly as either a 0 or a 1. Quantum computers, by contrast, exploit quantum states that can exist in many configurations simultaneously, a property that allows certain calculations to be performed at speeds unreachable by any classical machine. But that same quantum superposition is exquisitely sensitive. Stray electromagnetic fields, thermal fluctuations, or even the tiniest atomic imperfections in the material hosting the quantum state can destroy it, a process known as decoherence. Most quantum devices today operate only inside carefully controlled laboratory environments, shielded at cryogenic temperatures and isolated from external noise. For quantum technology to become practical and scalable, researchers need materials that can maintain quantum behavior in far less forgiving conditions.

“One of the biggest challenges in quantum technology is finding materials that can maintain their quantum behavior outside carefully controlled laboratory environments,” Mandal explained. “To overcome that challenge, we need to understand both how electrons interact with one another and how they interact with the natural vibrations of atoms in a material. Together, these combined interactions can dramatically reshape a material’s quantum properties and, if properly controlled, may help us design better materials for future quantum technologies.”

That dual interaction — electrons with electrons, and electrons with atomic vibrations — sits at the heart of the project. In any solid material, atoms are never perfectly still. They vibrate around their equilibrium positions, producing quantized lattice vibrations known as phonons. When electrons moving through the crystal scatter off these phonons, the resulting electron-phonon coupling can profoundly alter the material’s electronic structure. In some circumstances it enables superconductivity, the remarkable phenomenon in which electrical current flows with zero resistance and no energy loss. In others, it degrades the coherence of quantum states and undermines the very properties a quantum device depends upon. Understanding and controlling these interactions, Mandal argues, may hold the key to engineering materials whose quantum behavior is not merely preserved but actively stabilized by their internal structure.

The materials at the center of the research are not simple bulk crystals. Mandal’s team will focus on specially engineered substances assembled by stacking different two-dimensional layers one atomic plane at a time — a technique that has become one of the most powerful strategies in modern materials science. The approach is often compared to combining ingredients in a recipe: individually, the constituent layers may be rather ordinary, but stacked together in precise sequences, they can produce quantum properties that neither material exhibits on its own. Twisted or stacked layers of graphene, transition-metal dichalcogenides, and other layered compounds have already revealed superconductivity, magnetism, and topological phenomena invisible in the parent materials. By computing how electrons and phonons behave in these engineered stacks, Mandal’s group hopes to establish design principles for combining layers in ways that produce robust, technologically useful quantum phases.

To carry out this work, the project will rely on advanced computational methods and large-scale simulations capable of capturing the intertwined dance of electrons and atomic vibrations. These first-principles calculations, grounded in quantum mechanics rather than empirical fitting, allow researchers to predict whether a candidate material will exhibit special properties such as superconductivity before it is synthesized. A second major thread of the research concerns topological quantum states — exotic electronic phases whose defining characteristics are protected by the global structure of the material’s quantum wavefunction rather than by local details. This built-in protection means topological states can resist certain types of disturbances that would destroy ordinary quantum states. Many physicists believe that marrying superconductivity with topological quantum states could yield the basic building blocks of fault-tolerant quantum computers, whose information would be encoded in ways intrinsically immune to many sources of error. Identifying real materials that combine both ingredients is one of the field’s most sought-after goals, and computational screening offers a way to narrow an effectively infinite search space down to the most promising candidates.

Beyond the science itself, a central aim of the project is to democratize access to the computational machinery of quantum materials discovery. Mandal will develop free, openly available software that other researchers can use to hunt for new quantum materials, lowering the technical and financial barriers that often restrict advanced simulations to well-funded laboratories. The practical payoff could be substantial. “Instead of making every quantum material possible in a laboratory to see which perform well, researchers could first use the software to run simulations to identify the most promising options,” Mandal said. “Then scientists could focus their laboratory experiments on materials most likely to have useful quantum properties.” In a field where synthesizing and characterizing a single new compound can take months and considerable resources, the ability to computationally pre-screen candidates promises to compress discovery timelines and redirect experimental effort toward the materials most likely to succeed.

The award also carries a substantial educational and workforce mission, reflecting the CAREER program’s emphasis on integrating research with teaching. Mandal will create accessible educational materials explaining quantum science and technology to broad audiences, organize immersive summer workshops at WVU, and provide hands-on research opportunities for high school, undergraduate, and graduate students. Participants will learn computational skills that are increasingly indispensable not only in academic research but also in advanced manufacturing, high-performance computing, and the rapidly expanding quantum industry. “As quantum technologies move from the laboratory toward real-world applications, there is a growing need for a workforce that understands both the science and the tools behind them,” Mandal said. “This project allows us to train students at multiple levels and help prepare them for careers in one of the fastest growing areas of science and technology.” The training component holds particular significance for West Virginia, where building a skilled technology workforce is viewed as central to the state’s future economic development. Maura McLaughlin, chair of the Department of Physics and Astronomy and Eberly Distinguished Professor of Physics and Astronomy, praised the project as work “at the cutting edge of an extraordinarily innovative field,” noting that it will open new opportunities for West Virginia students while helping build talent critical to the state’s growth.

Mandal joined the WVU Department of Physics and Astronomy in 2022, and the CAREER award arrives on the heels of a remarkable stretch of recognition. In December 2025, his work on quantum materials was highlighted by the journal Nature Communications, and earlier in 2026 he received the Cottrell Scholar Award from the Research Corporation for Science Advancement. His Computational Quantum Materials Group receives support from an array of agencies and foundations, including the U.S. Department of Energy, the National Science Foundation, the U.S. Department of Defense, and the Research Corporation for Science Advancement — a breadth of backing that reflects the strategic importance of quantum materials research across the federal science enterprise.

Looking further ahead, Mandal frames the project as a step toward a fundamentally predictive paradigm for materials discovery. “The long-term goal is to create a way to predict which materials could be useful for quantum technology before they are ever made in a laboratory,” he said. “If we can find materials or a combination of materials that naturally support quantum states, we can help to build the foundation for new quantum technologies that could benefit society for decades to come.” If that vision is realized, the quantum computers and sensors of the future may rest not on materials discovered by accident, but on substances designed atom by atom, their quantum properties calculated and guaranteed long before the first crystal is grown.

News Publication Date: 10-Sep-2026

Web References: Not provided

Keywords

quantum materials, NSF CAREER award, quantum computing, electron-phonon coupling, superconductivity, topological quantum states, computational materials design, atomically layered materials, West Virginia University, quantum decoherence, high-performance simulation, quantum workforce training

At the center of READINESS is an autonomous laboratory platform that links machine-learning systems to physical equipment capable of producing and analyzing materials. Instead of relying exclusively on scientists to select a composition, prepare a sample, run an experiment and interpret the results, the system will allow artificial intelligence to guide the entire cycle. Algorithms can evaluate previous measurements, identify promising experimental conditions and propose the next set of tests. Robotic systems then carry out those instructions, while advanced characterization tools measure the resulting material properties. The information is fed back into the software, enabling the platform to continuously improve its decisions.

The project will focus initially on materials with potentially major consequences for computing and communications, including two-dimensional materials, oxide semiconductors and diamond thin films. Two-dimensional materials are only a few atoms thick and can exhibit electrical, optical and mechanical properties that differ dramatically from those of their bulk counterparts. Oxide semiconductors can be useful in displays, sensors, power electronics and other devices, while diamond films may offer exceptional thermal conductivity and durability. By rapidly testing different synthesis conditions, researchers hope to identify materials that could support faster electronics, lower-power computing and emerging quantum technologies.

SUNY Poly will contribute specialized expertise in semiconductor materials processing, thin-film fabrication and workforce development. Dr. Michael Carpenter, the institute’s vice president for research and a co-principal investigator, will help lead development of an autonomous physical vapor deposition system for oxide thin-film synthesis. Physical vapor deposition, or PVD, creates thin coatings by vaporizing a source material inside a controlled chamber and depositing it onto a substrate. Parameters such as temperature, pressure, gas composition and deposition rate can strongly influence the final film’s structure and performance. Automating these variables will allow the research team to explore combinations that would be difficult, slow or expensive to test manually.

The institute will also oversee installation of an autonomous chemical vapor deposition system developed at Rice University by materials scientist and principal investigator Dr. Jun Lou. Chemical vapor deposition, or CVD, forms materials when gaseous chemical precursors react or decompose on a heated surface. It is widely used to manufacture semiconductor layers, carbon-based materials and other technologically important films. For two-dimensional materials, small changes in precursor flow, temperature and substrate conditions can determine whether a uniform atomic layer forms or whether defects, unwanted phases and irregular growth appear. An autonomous CVD platform can systematically map these conditions and use its findings to refine future experiments.

A defining feature of READINESS is that SUNY Poly and Rice University will operate identical autonomous PVD and CVD systems. Matching equipment at separate locations will create what researchers describe as a shared node for programmable experimentation. Scientists can compare results across laboratories, reproduce promising recipes and examine how small differences in equipment, environment or materials influence outcomes. This approach addresses a persistent challenge in materials science: a result that works in one laboratory may not transfer reliably to another. Standardized autonomous systems, connected through digital infrastructure, could improve reproducibility while allowing experiments to continue remotely.

The platform will also incorporate digital twin technology. A digital twin is a computational representation of a physical system that can simulate how equipment and materials are expected to behave. In the READINESS environment, such models could help predict the effects of changing process conditions before a real experiment is launched. Researchers might use a digital twin to estimate how a temperature shift could affect crystal growth, or how a change in gas flow might alter the thickness and defect density of a film. The simulations will not replace laboratory measurements, but they can help prioritize experiments, reduce wasted resources and make autonomous decision-making more efficient.

For SUNY Poly, the initiative is intended to advance research and prepare people for an evolving semiconductor industry. The institute will help create short courses and stackable credentials for students, engineers and industry professionals seeking skills in semiconductor manufacturing, laboratory automation and AI-enabled materials research. These credentials could provide flexible pathways for workers who need targeted technical training without pursuing a full degree. Participants may learn how to operate deposition equipment, interpret materials data, maintain robotic systems, manage cloud-connected laboratories or work with machine-learning tools that guide experimental processes.

The workforce component reflects a broader transformation taking place in scientific research. As laboratories become increasingly automated, future researchers will need expertise that crosses traditional boundaries between materials science, electrical engineering, computer science, robotics and data analysis. A scientist working with an autonomous laboratory may not personally perform every deposition or measurement, but will need to understand how the equipment works, how data are generated and how algorithms make recommendations. Dr. Winston Soboyejo, president of SUNY Poly, said the project demonstrates the institute’s growing role in semiconductor innovation, advanced manufacturing and applied artificial intelligence while strengthening the talent pipeline needed for the country’s technology sector.

READINESS is supported through the NSF’s Programmable Cloud Laboratories Test Bed initiative, a national effort to establish remotely accessible research facilities that use artificial intelligence and automation to make experimentation faster, more reliable and more reproducible. If successful, the model could change the pace of materials discovery by allowing researchers in different locations to share equipment, experimental protocols and real-time data through a common digital environment. Rather than waiting weeks or months to complete a sequence of experiments, scientists could use autonomous systems to run repeated tests around the clock, while machine-learning tools identify the most promising directions.

The project also illustrates why advanced materials research is becoming increasingly connected to national semiconductor strategy. Modern technologies depend on materials that can conduct, insulate, emit, detect or withstand extreme conditions with exceptional precision. Discovering those materials is often slow because the space of possible chemical compositions and manufacturing conditions is enormous. By combining automated synthesis with artificial intelligence, the READINESS team aims to search that space more intelligently and to move promising discoveries more quickly toward scalable manufacturing. Dr. Carpenter said the collaboration could accelerate both scientific discovery and industrial adoption, while creating new opportunities for students, researchers and companies.

For Dr. Lou, the partnership between Rice University and SUNY Poly represents a new approach to AI-enabled experimentation in which research institutions share not only ideas, but also compatible machines, data and training opportunities. The long-term ambition is to make advanced laboratories more accessible and to build a connected ecosystem in which materials can be designed, synthesized, analyzed and optimized across institutional boundaries. As autonomous laboratories become more capable, they could help researchers tackle some of the most difficult problems in electronics and quantum technology while giving the next generation of scientists hands-on experience with the tools likely to define the future of manufacturing.

Subject of Research: Artificial intelligence, autonomous laboratories, semiconductor materials, robotics, thin-film synthesis, quantum materials and workforce development

Article Title: SUNY Poly Joins $19.9 Million National Science Foundation Initiative to Accelerate AI-Driven Materials Discovery

News Publication Date: Tuesday, July 28, 2026

Web References: https://news.rice.edu/news/2026/accelerating-discovery-rice-receives-nearly-20m-nsf-award-ai-powered-materials-laboratory

Image Credits: SUNY Polytechnic Institute

Keywords

Artificial intelligence, materials discovery, autonomous experimentation, semiconductor manufacturing, robotics, cloud laboratories, physical vapor deposition, chemical vapor deposition, two-dimensional materials, oxide semiconductors, diamond thin films, quantum technologies, Rice University, SUNY Polytechnic Institute, National Science Foundation

The peculiar superconducting characteristics of UTe2 signify that it belongs to the class of “unconventional superconductors.” While standard superconductivity arises due to electron pairing mediated by lattice vibrations at exceedingly low temperatures, UTe2’s superconductivity likely stems from an altogether different origin, potentially linked to quantum magnetic fluctuations and electron interactions within the uranium-based crystal lattice. The challenge for researchers has been probing these subtle effects under extreme laboratory conditions, where magnetic fields can soar beyond what most materials can withstand.

Addressing this challenge, a team of scientists from the Institute of Science and Technology Austria (ISTA) has pioneered an innovative experimental approach that allows unprecedented investigation of UTe2 under these intense magnetic regimes. Led by PhD student Valeska Zambra, and guided by Assistant Professor Kimberly Modic, the researchers developed a method that “shakes” the sample subtly while it experiences pulsed ultra-high magnetic fields. This mechanical stimulation, executed on a micro-scale cantilever setup, modulates the crystal’s orientation relative to the magnetic field, effectively causing the field direction experienced by the material to oscillate in time.

This delicate experimental “wiggle” enables measurement of the transverse magnetic susceptibility—how magnetization responds perpendicular to the applied magnetic field—right at the brink of reentrant superconductivity. Remarkably, this property had eluded scientists due to technical limitations previously. Through this approach, the ISTA team discovered that near the onset of reentrant superconductivity, UTe2 exhibits “giant” transverse magnetic fluctuations, suggesting that such fluctuations act as the mysterious “glue” binding electrons into superconducting pairs at ultra-high magnetic fields.

The significance of these findings cannot be overstated. Conventional wisdom holds magnetic fluctuations as drivers of unconventional superconductivity, yet UTe2 appears to diverge from its close relatives, such as UCoGe and URhGe, which are themselves inherently magnetic. Strikingly, UTe2 does not show conventional magnetism, making its superconducting states especially puzzling. The detection of robust transverse magnetic fluctuations near its reentrant superconductivity regime provides a compelling clue toward reconciling this anomaly, indicating that subtle quantum magnetic phenomena underpin these exotic phases.

Practically, creating and measuring samples of UTe2 is no trivial task. The ISTA group specializes in sculpting diminutive crystals no larger than a human hair in thickness, meticulously integrating them into their experimental apparatus. This finesse is crucial not only for studying pristine, defect-free specimens but also because many other investigative techniques simply cannot be employed at these nano- to micro-scales, particularly under intense magnetic fields. The adaptability and sensitivity of this cantilever-based approach have attracted attention from high-field laboratories globally, positioning it as a new standard for probing quantum materials in extreme environments.

Pulsed magnet laboratories generate magnetic fields that can ramp up to 60 Tesla within mere fractions of a second—a temporal scale that challenges even the fastest sensors. The innovative mechanostimulation method developed by Zambra and colleagues cleverly exploits this rapid cycling by measuring the dynamic response of the sample’s magnetization in real time, capturing transient and nonlinear effects previously hidden in static measurements. This temporal precision opens new pathways to interrogate the interplay between magnetism and superconductivity under conditions that replicate those required for future quantum technologies.

Despite the excitement surrounding these findings, the researchers emphasize that this work represents a fundamental advance rather than an immediate technological breakthrough. Understanding the microscopic mechanisms that govern UTe2’s superconductivity, especially its reentrant phase at extreme magnetic fields and cryogenic temperatures, forms part of the foundational science necessary to harness these phenomena for applications such as quantum computing or ultra-efficient energy transmission. As history has shown with superconductivity discovered over a century ago, enabling applications often requires years or decades of subsequent research and serendipitous innovation.

The journey toward decoding UTe2’s secrets exemplifies the broader significance of curiosity-driven research in quantum materials. While many investigations are application-focused, aimed at finding specific materials for next-generation devices, explorations like those at ISTA reveal novel states of matter and complex electron correlations that deepen fundamental understanding. The insights gained from UTe2’s reconnection with superconductivity at extreme conditions not only challenge textbook physics but also expand the horizons for discovering unforeseen quantum phases with unprecedented properties.

As this novel measurement technique gains traction beyond ISTA, the scientific community stands poised to replicate and extend these experiments across various quantum materials exhibiting unconventional superconducting behavior. By enabling access to transverse magnetic fluctuations across a broad spectrum of conditions, this method is likely to accelerate discoveries and refine models of strongly correlated electron systems. Such progress could catalyze breakthroughs in materials science, inform theoretical condensed matter physics, and potentially reveal previously unknown routes to harnessing superconductivity for transformative technologies.

The profound mysteries uncovered by uranium ditelluride and its reentrant superconductivity emphasize that nature still holds many astonishing behaviors within seemingly simple compounds. Through perseverance, ingenuity, and precise experimentation, scientists like Zambra and Modic are steadily illuminating these enigmas. Their work underscores the timeless allure of chasing fundamental questions in physics—questions that may reshape future technological landscapes in ways yet unimaginable, reminding us that the boundaries of knowledge are continually expanding.

In closing, while the practical uses of these exotic superconducting states remain speculative, the discovery of giant transverse magnetic fluctuations near UTe2’s reentrant superconducting phase opens a new chapter in the understanding of quantum materials under extreme conditions. The method pioneered by the ISTA team represents a powerful new tool in condensed matter physics, one that not only answers longstanding puzzles but also cultivates fertile ground for future innovations within and perhaps beyond the realm of superconductivity.

Subject of Research:
Not applicable

Article Title:
Giant transverse magnetic fluctuations at the edge of re-entrant superconductivity in UTe2

News Publication Date:
29-Apr-2026

Web References:
http://dx.doi.org/10.1038/s41467-026-71899-7

References:
Valeska Zambra, Amit Nathwani, Muhammad Nauman, Sylvia K. Lewin, Corey E. Frank, Nicholas P. Butch, Arkady Shekhter, B. J. Ramshaw, and K. A. Modic. 2026. Giant transverse magnetic fluctuations at the edge of re-entrant superconductivity in UTe2. Nature Communications. DOI: 10.1038/s41467-026-71899-7

Image Credits:
© ISTA

Keywords

Superconductivity, Electrical properties, Electromagnetic properties, Quantum electrodynamics, Ultracold atoms, Magnetic fields

Quantum materials are distinguished by their unique and often exotic responses to external stimuli such as magnetic fields, temperature variations, and electromagnetic radiation. Phenomena like superconductivity, where electrical resistance vanishes, spontaneous magnetic ordering without external influence, and charge density waves emerge from the delicately balanced interactions between electrons and atomic lattices. These phenomena have intrigued the scientific community, pushing the boundaries of understanding in condensed matter physics and inspiring the exploration of yet unknown novel effects that may underpin next-generation technologies.

Central to comprehending these complex behaviors is the profound understanding of electron dynamics within these solids. Electrons in quantum materials do not behave as isolated particles but exhibit collective phenomena, resulting in macroscopic physical properties that can be dramatically altered by minute changes in electronic distribution. This distribution serves as a fundamental “fingerprint” of each material, encoding its quantum mechanical characteristics. By mastering the manipulation of these electronic fingerprints, scientists aim to tailor materials with desired functionalities, offering unprecedented control over electronic, magnetic, and optical properties for innovative device applications.

Professor Fedchenko’s approach leverages sophisticated photon-based techniques to probe the electronic landscapes of quantum materials. Utilizing a spectrum of photon sources, including laser light, high-energy X-rays, and traditional discharge lamps, her experimental setups facilitate the ejection of electrons from a material’s surface through the photoelectric effect. The kinetic energy and angular distribution of these emitted electrons provide direct insight into the momentum and energy configurations of electrons inside the material, thus revealing its internal quantum structure and interactions.

A key instrument in her experimental arsenal is angle-resolved photoemission spectroscopy (ARPES), enhanced by state-of-the-art time-of-flight electron detection. This technique not only captures the energy but also the momentum distribution of photoemitted electrons with exceptional precision and timing resolution, enabling a direct mapping of the electronic band structure. The detailed spectral information obtained through ARPES informs on how electrons pair, scatter, or localize—critical factors underpinning quantum phenomena such as high-temperature superconductivity and topological states of matter.

Researching these frontier materials requires not only cutting-edge instrumentation but also interdisciplinary collaboration across experimental and theoretical physics. Professor Fedchenko’s work bridges these domains, correlating empirical data with quantum mechanical models to deepen the fundamental understanding of strongly correlated electron systems. This synergy is vital for decoding the complex interplay between electronic correlations and lattice dynamics that govern the emergent properties observed in novel quantum states.

The establishment of the Gisela and Wilfried Eckhardt Endowed Professorship for Experimental Physics at Goethe University Frankfurt, proudly held by Professor Fedchenko, marks a significant milestone in institutional support for quantum materials science. This prestigious position, generously funded by the Volkswagen Foundation and the legacy of alumna Gisela Eckhardt, affords the resources necessary to pursue ambitious experimental programs, fostering innovation at the intersection of solid-state physics and materials engineering.

Professor Fedchenko’s academic journey is emblematic of exceptional international scholarship and scientific contribution. Originating from Ukraine, she earned her doctorate in physics and mathematics before advancing to research roles that shaped her expertise in photoemission spectroscopy at prominent institutions, including Johannes Gutenberg University Mainz and DESY in Hamburg. Her trajectory exemplifies the global collaboration and dedication propelling quantum materials research forward.

Her inventive spirit is further exemplified by her co-holding of a patent with French collaborators for a novel pulsed electron source and surface analysis system. This technology harnesses a cold atom trap to produce a monochromatic, high-resolution pulsed photon beam, enabling unprecedented surface studies of complex materials. Such advancements are critical to pushing the frontiers of surface science and electron spectroscopy.

The implications of Professor Fedchenko’s research extend well beyond academic curiosity. Quantum materials hold the key to transformative technologies—from quantum computers that exploit electron coherence to sensors with sensitivity beyond classical limits, and solar cells enhanced by quantum effects for superior energy conversion efficiencies. The comprehensive understanding gleaned through her photoemission spectroscopy work is foundational to harnessing these capabilities.

Colleagues and university leadership acknowledge the profound impact of this research direction. President Enrico Schleiff underscores the strategic importance of this professorship in enriching collaboration within the Rhine-Main Universities alliance and securing momentum in quantum materials innovation amid shrinking academic funding landscapes. Simultaneously, the Volkswagen Foundation’s Dr. Georg Schütte highlights the critical role of sustained investment in complex basic science infrastructure and the successful culmination of their flagship Lichtenberg Program.

Ultimately, the integration of advanced experimental physics techniques with rigorous theoretical frameworks under Professor Fedchenko’s leadership is poised to yield transformative insights into the quantum world. These revelations will pave the way for rational design and controlled manipulation of quantum materials, heralding a new era of innovative devices that capitalize on their extraordinary macroscopic properties born from the quantum realm.

As this vibrant research community moves forward, the foundational understanding of electron behavior in quantum materials will remain at the heart of unlocking future technologies capable of addressing the pressing challenges of computing power, sensing precision, and energy sustainability in the 21st century.

Subject of Research:
Quantum materials; electronic structure; angle-resolved photoemission spectroscopy; experimental solid-state physics; photoelectric effect; quantum phenomena in materials.

Article Title:
Unveiling the Quantum Frontier: Professor Olena Fedchenko’s Pioneering Insights into the Electronic Structures of Quantum Materials

News Publication Date:
2025

Image Credits:
Ekaterina Fedorenko / Goethe University Frankfurt

Keywords

Quantum mechanics, Quantum materials, Quantum measurement, Quantum states, Quantum tunneling, Photoemission spectroscopy, Experimental physics, Solid-state physics, Condensed matter physics, Photonics, Electron spectroscopy, Quantum phenomena

When two sheets of the same TMD semiconductor, for instance MoTe₂ or tungsten diselenide (WSe₂), are stacked with a slight angular mismatch—a phenomenon known as “twisting”—a moiré superlattice arises. This moiré pattern drastically alters the electronic landscape, generating flat bands near the valence band edge. These bands are characterized by a quantized topological invariant known as the Chern number, making them “Chern flat bands.” The flatness of these bands significantly suppresses the kinetic energy of electrons, allowing Coulomb interactions to dominate. Such a domination is critical because it fosters strong correlations that are at the heart of many exotic quantum states.

The presence of strong electron correlations in conjunction with the intrinsic band topology leads to a rich interplay that can induce a variety of novel phases. Among the most striking experimental achievements is the observation of the quantum anomalous Hall (QAH) effect, not only in its integer but also its fractional form at zero external magnetic field—a phenomenon that was previously unattainable in any material system. This zero-field fractional QAH state showcases how electron-electron interactions combined with topological flat bands can lead to emergent collective behaviors that defy conventional electron theory.

Complementing these discoveries, researchers have identified quantum spin Hall (QSH) insulators within twisted bilayer TMDs. These QSH states manifest helical edge modes that are robust against certain types of scattering, enabling dissipationless spin currents along the boundaries of the material. The coexistence of such insulating phases with metallic states—like the anomalous Hall metal—and more exotic compressible states known as zero-field composite Fermi liquids showcases the extraordinary versatility of moiré TMDs in accessing diverse electronic phases within a single platform.

One particularly fascinating aspect of twisted bilayer MoTe₂ is the emergence of unconventional superconductivity proximate to fractional QAH states. The proximity of superconductivity to such strongly correlated topological phases hints at novel pairing mechanisms that transcend classical Bardeen-Cooper-Schrieffer (BCS) theory. This discovery opens promising pathways for engineering superconducting states that could leverage the intricate interplay between topology, strong correlation, and reduced dimensionality, providing clues to a deeper understanding of high-temperature superconductivity and related quantum phases.

Crucially, the tunability of these moiré systems via electrostatic gating and displacement fields offers an unprecedented level of control over their quantum phases. Experimentalists can sweep through a variety of correlated and topological states by adjusting carrier density and interlayer potential in situ, enabling direct exploration of quantum phase transitions and critical phenomena within a single device architecture. This high degree of tunability establishes twisted bilayer TMDs as a versatile quantum simulator, bridging theoretical predictions and experimental realizations.

The theoretical framework underpinning these accomplishments involves advanced concepts in band topology, symmetry considerations, electron-electron interactions, and fractionalization of charge. The inherent topology of flat bands, marked by nonzero Chern numbers, enforces quantized Hall conductance under appropriate conditions, while electron correlations induce spontaneous symmetry breaking and emergent fractionalized quasiparticles. Understanding these phenomena requires sophisticated modeling techniques including Hartree-Fock calculations, Chern-Simons theory, and numerical approaches such as density matrix renormalization group (DMRG) methods.

Looking forward, the review highlights the tantalizing prospect of discovering even more exotic phases, such as non-Abelian quasiparticles that obey unconventional braiding statistics. These quasiparticles are prime candidates for fault-tolerant topological quantum computation due to their intrinsic error-resilience. Furthermore, the interplay between superconductivity and nontrivial topology raises the possibility of realizing topological superconductivity, a highly sought-after state with Majorana zero modes. Achieving these goals demands further improvements in sample quality, precise control of twist angles, and enhanced experimental probes.

Beyond fundamental physics, the implications of these advances extend to quantum technology applications, including quantum information processing and spintronics. The ability to engineer and manipulate strongly correlated topological phases in an electrically controllable manner could lead to the development of novel quantum devices based on moiré superlattices, capable of harnessing exotic quasiparticles for robust data storage and transmission. This gives rise to exciting opportunities for integrating two-dimensional materials into scalable quantum platforms.

In summary, twisted bilayer MoTe₂ and related moiré TMD materials represent a vibrant frontier in condensed matter research, where the convergence of topology, strong correlations, and reduced kinetic energy facilitates the emergence of diverse and unprecedented quantum phases. The synergy of experimental breakthroughs with theoretical insights paves the way toward harnessing these phases not only to deepen our understanding of quantum matter but also to spearhead future quantum technologies.

As our capacity to fabricate cleaner, more uniform moiré superlattices advances, the stage is set for unveiling the full landscape of emergent phenomena in these materials. The frontier of twisted bilayer TMDs brims with promise, poised to rewrite our grasp of quantum phases and to inspire a new generation of quantum devices shaped by the principles of topology and electron interaction.

Subject of Research:
Twisted bilayer transition metal dichalcogenides (TMDs) and their emergent quantum phases, focusing on strongly correlated and topological states in moiré superlattices.

Article Title:
Not explicitly stated in the input.

News Publication Date:
Not explicitly stated in the input.

Web References:
Not explicitly provided in the input.

References:
DOI 10.1093/nsr/nwaf570 (Corresponding to the review article in National Science Review).

Image Credits:
©Science China Press

Keywords:
Twisted bilayer MoTe₂, moiré superlattice, Chern flat bands, quantum anomalous Hall effect, quantum spin Hall insulator, topological phases, strong electron correlations, unconventional superconductivity, zero-field fractional quantum Hall state, non-Abelian quasiparticles, topological superconductivity, quantum simulators.

ARPES has long served as an indispensable tool for physicists probing the momentum and energy of electrons in solids, revealing the intricate band structures and interactions that define material properties. However, the exclusion of magnetic fields in traditional ARPES setups represented a significant limitation. Magnetic fields are essential to unraveling many quantum effects, as they fundamentally alter electron dynamics by breaking time-reversal symmetry and inducing novel electronic phases. By ingeniously incorporating a tunable magnetic coil external to the sample, magnetoARPES overcomes this barrier, allowing scientists to examine the full spectrum of electronic responses to magnetic stimuli.

The conception of magnetoARPES emerged from a series of delicate simulations and experimental validations pioneered by Associate Professor Ming Yi and his collaborator Jianwei Huang. Their work demonstrated that a small, adjustable magnetic field could be applied without compromising the momentum resolution of ARPES data—an impressive feat given the sensitivity of photoemission measurements. This breakthrough paves the way for momentum-resolved explorations of magnetic effects in a host of quantum materials, a feat that was previously theoretically tantalizing but experimentally elusive.

To validate their novel technique, the research team focused on a kagome superconductor, a material characterized by a lattice of corner-sharing triangles reminiscent of the traditional Japanese kagome basket weaving pattern. Kagome lattices have attracted immense attention for their ability to manifest exotic electronic states such as flat bands and topologically nontrivial phases. When studied with magnetoARPES, this superconductor unveiled compelling evidence for momentum-dependent symmetry breaking driven by the magnetic field, offering fresh insights into the intimate connections between superconductivity and underlying electron order parameters.

One of the most striking findings from the magnetoARPES experiments was the alignment of electron domains with opposite circulating currents, a phenomenon known in theoretical physics as loop current order. This behavior suggests that electrons on the kagome lattice collectively break time-reversal symmetry, a fundamental tenet that governs many physical processes. Previous indirect observations hinted at such symmetry breaking, but only through the lens of magnetoARPES were researchers able to directly confirm these elusive currents in momentum space, linking them explicitly with the material’s superconducting properties.

This direct observation is particularly significant as it sheds light on the mysterious coexistence of charge density waves (CDWs) and superconductivity in kagome systems. The interplay between CDWs—periodic modulations in electron density—and superconducting states has remained an open question in condensed matter physics. MagnetoARPES data suggest that the breaking of time-reversal symmetry via loop current orders is intimately tied to these charge modulations, potentially playing a pivotal role in the emergence of superconductivity.

By extending ARPES into a new experimental dimension, magnetoARPES not only enriches our understanding of quantum phases in kagome materials but also sets a powerful precedent for studying a broad range of correlated electron systems. The ability to tune and probe electron dynamics under external magnetic fields will allow physicists to explore hidden orders, topological effects, and novel excitations in other unconventional superconductors, magnetic materials, and topological insulators.

Moreover, the development of magnetoARPES exemplifies how persistent interdisciplinary efforts—combining theoretical simulations, precision instrument design, and meticulous experimentation—can push the frontiers of measurement science. This approach enables scientists to experimentally manipulate key symmetry-breaking mechanisms central to many quantum materials, offering hope for functional control of phases that can be harnessed in future quantum technologies.

Looking ahead, the Rice University team envisions further refinements of magnetoARPES, including enhancing magnetic field strength, improving spatial resolution, and integrating complementary probes. Such advancements would deepen our capacity to map the momentum-resolved electronic response with even greater fidelity, accelerating discoveries in the physics of strongly correlated materials and guiding the design of superconductors and quantum devices with tailor-made properties.

The implications also extend beyond fundamental research. Understanding and controlling electronic symmetry breaking could lead to advances in energy-efficient electronics, quantum computing architectures, and sensors, all of which rely heavily on the subtle manipulation of electron correlations and collective behaviors in materials. MagnetoARPES stands to become an essential tool in translating quantum mechanics from abstract theory into practical technology.

The pioneering demonstration of magnetic field-induced momentum-dependent symmetry breaking in a kagome superconductor marks a watershed moment in the exploration of quantum matter. Through the lens of magnetoARPES, researchers have unlocked a new vista on the complex dance of electrons—a dance choreographed by magnetic fields and quantum interactions, now captured with unparalleled clarity. This achievement promises to inspire and empower a vibrant community of physicists eager to chart the rich landscapes of emergent quantum phenomena.

Subject of Research: Not applicable
Article Title: Magnetic field-induced momentum-dependent symmetry breaking in a kagome superconductor
News Publication Date: 11-Mar-2026
Web References: 10.1038/s41567-026-03205-7
Image Credits: Jianwei Huang/Rice University

Keywords
Quantum mechanics; MagnetoARPES; Kagome superconductor; Symmetry breaking; Time-reversal symmetry; Charge density waves; Superconductivity; Angle-resolved photoemission spectroscopy; Magnetic field effects; Momentum-resolved spectroscopy; Quantum materials; Electronic correlations

EuCo₂Al₉ distinguishes itself as a good metal with exceptional electrical and thermal conductivity, defying conventional wisdom that spin supersolidity requires insulating environments. At the heart of the phenomenon lies the high-spin Eu²⁺ ions arrayed in a complex three-dimensional lattice comprising stacked triangular layers. The intricate interplay between Ruderman–Kittel–Kasuya–Yosida (RKKY) interactions—mediated by conduction electrons—and long-range dipolar couplings stabilizes the unusual spin-supersolid phases observed in this compound.

Neutron diffraction experiments provide definitive microscopic evidence of the spin supersolid state, revealing a coexistence of out-of-plane and in-plane magnetic orders within ECA. These concurrent orders manifest as Y and V phases in magnetization, highlighting the coexistence of solid-like magnetic rigidity and superfluid-like spin coherence across the lattice. Such direct observation confirms the theoretical predictions that have so far eluded empirical validation in metallic systems.

The persistent magnetization plateau at one-third of the saturation magnetization, a hallmark of frustrated magnetism consistent with spin supersolids, is captured exquisitely by a comprehensive RKKY–dipolar theoretical model developed by the research team. This framework not only explains the sequence of magnetic phases but also accounts for the substantial quantum fluctuations inherent in the metallic environment. These fluctuations appear enhanced by conduction electrons, challenging classic magnetic paradigms and hinting at rich underlying quantum many-body physics.

Electrical resistivity measurements present a novel transport-based probe of the spin supersolid transitions, as conduction electrons scatter off dynamic local magnetic moments. This coupling manifests in sharp anomalies in resistivity correlating with magnetic phase boundaries, providing real-time, non-invasive diagnostics of spin supersolidity. Such measurements complement neutron diffraction and magnetization data, enriching the multi-faceted observational landscape.

Remarkably, EuCo₂Al₉ achieves ultralow cooling down to 106 millikelvin through an adiabatic demagnetization process leveraging its giant magnetocaloric effect. This effect generates significant entropy changes tied to the spin-supersolid transitions, reflected in sharp features of the magnetic Grüneisen ratio – a thermodynamic quantity measuring how magnetic entropy varies with field and temperature. The synergy of large magnetic entropy and ultrahigh thermal conductivity in a metallic host creates a uniquely efficient sub-Kelvin refrigerant platform.

This discovery fundamentally shifts paradigms, demonstrating that metallic environments can not only host but also enhance spin supersolidity through conduction-electron-mediated interactions. The ability to combine solid and superfluid spin orders in a metal with high thermal conductivity bridges the gap between fundamental quantum phenomena and potential technological applications. It shows promise for high-performance refrigeration in quantum computing and cryogenic sensors, where stable and efficient ultralow temperatures are critical.

Beyond refrigeration, the presence of metallic spin supersolids could influence future studies of quantum phase transitions, magneto-transport phenomena, and spintronics devices. The coupling between itinerant electrons and local moments within a spin supersolid matrix invites exploration of unconventional mobility, magnetoresistance effects, and possibly novel quantum coherence phenomena extending over macroscopic scales.

The experimental realization of this metallic spin supersolid relied heavily on sophisticated neutron scattering techniques to resolve spatial spin textures alongside precise magnetization and transport measurements under varying magnetic fields and temperatures. Collectively, these multidisciplinary methods illuminated the delicate balance between competing magnetic orders stabilized by RKKY and dipolar couplings. The team’s theoretical insights further elucidated the pivotal role of quantum fluctuations enhanced by conduction electrons, unlocking new perspectives on entropic cooling mechanisms.

EuCo₂Al₉’s remarkable combination of electrical and thermal transport properties with complex magnetic order paves the way for engineering designer quantum materials that balance competing interactions to achieve tailored low-temperature functionalities. This tunability could inspire novel refrigeration technologies integrating magnetocaloric devices with efficient electrical control, potentially revolutionizing cryoelectronics and quantum information processing.

As the first reported metallic spin supersolid, EuCo₂Al₉ challenges the prevailing notion that spin supersolidity is confined to insulating magnets, transforming our understanding of magnetic ground states and their interplay with conduction electrons. Future studies may unveil other rare-earth or transition-metal compounds exhibiting similar phenomena, expanding the class of materials available for fundamental physics experiments and practical applications alike.

In conclusion, the breakthrough discovery of a metallic spin supersolid in EuCo₂Al₉ represents a milestone in condensed matter physics and materials science, marrying intricate spin textures with metallic conduction. Its pronounced magnetocaloric effect, quantum fluctuations, and multi-order magnetic phases provide new pathways toward efficient and effective sub-Kelvin refrigeration. This work stands at the forefront of quantum materials research, heralding both fundamental insights and transformative technologies beyond the laboratory.

Subject of Research:
Discovery of a metallic spin supersolid state and magnetocaloric effects in the rare-earth compound EuCo₂Al₉, exploring the coexistence of magnetic orders mediated by RKKY and dipolar couplings in a metallic environment.

Article Title:
Giant magnetocaloric effect and spin supersolid in a metallic dipolar magnet

Article References:
Shu, M., Xu, X., Xi, N. et al. Giant magnetocaloric effect and spin supersolid in a metallic dipolar magnet. Nature (2026). https://doi.org/10.1038/s41586-026-10144-z

Image Credits:
AI Generated

DOI:
https://doi.org/10.1038/s41586-026-10144-z

The crux of this breakthrough lies in coherent nonlinear interactions driven by intense X-ray pulses. Traditionally, ultrafast spectroscopy techniques have excelled at capturing phenomena occurring on femtosecond or attosecond timescales, but with limited spatial resolution. Conversely, X-ray methods have provided atomic-scale resolution but lacked temporal precision. Marrying these domains, the contemporary research introduces coherent four-wave mixing processes operating in the X-ray domain, engaging with core-shell electrons to achieve simultaneous temporal and spatial finesse.

Four-wave mixing (FWM), a nonlinear optical process where photons interact via a medium to generate new frequencies, has been extensively studied in visible and infrared regimes but rarely realized with X-rays. The innovation centers on harnessing resonant electronic transitions within core-shell electrons of neon gas, utilizing powerful free-electron laser sources to deliver single broadband X-ray pulses. These pulses interact coherently, producing four-photon signals free from background noise—a feat that distinguishes the approach from prior methodologies.

Critically, this work demonstrates the ability to provoke and capture coherent anti-Stokes Raman scattering processes at X-ray energies, involving doubly resonant nonlinear phenomena. This mechanism effectively tracks coupled electronic states, electron correlation, and the motion of electrons with exquisite selectivity regarding both electronic state and atomic site. Thus, the resulting two-dimensional spectral maps chart photon input and output relationships, laying groundwork for multidimensional correlation spectroscopy at the atomic scale.

The experimental setup, leveraging advanced free-electron laser technology, orchestrates a complex sequence of time-delayed, multicolor X-ray pulses. By meticulously adjusting temporal delays, the team extends the utility of these nonlinear processes into the ultrafast time domain, opening avenues for real-time observation of electron wave packet evolution and dynamic electronic couplings. This capability marks an unprecedented step towards detailed visualization of ultrafast electron dynamics with atomic specificity.

From a theoretical standpoint, the research confirms long-standing predictions about the power of X-ray four-wave mixing to probe intricate electronic interactions that underpin fundamental chemical and physical phenomena. The observed nonlinear signals corroborate models of coherent electron motion and prompt reevaluation of core-shell electron behavior under intense electromagnetic fields. These insights hold promise for refining quantum mechanical descriptions and simulations of complex materials and biomolecular systems.

Beyond fundamental science, the implications of this research ripple across multiple fields. In materials science, the ability to monitor and manipulate electron correlations at atomic sites offers potential to engineer novel quantum materials with tailored electronic properties. In chemistry and biochemistry, the ultrafast, site-selective probing could revolutionize understanding of catalytic mechanisms and photochemical reactions critical to energy conversion and storage technologies. Moreover, the methodology might enhance biomedical imaging techniques by providing new contrast modalities sensitive to localized electron dynamics.

Significantly, the all-X-ray approach circumvents common limitations such as fluorescence background and scattering interference that plague traditional spectroscopies. The background-free nature of the four-photon interaction signals ensures high fidelity in capturing subtle electronic effects, preserving coherence and enhancing signal-to-noise ratio. This methodological clarity is vital for extending studies to more complex systems, including condensed phases, and potentially in situ environments.

Collaboration across experimental and theoretical domains was pivotal for the success of this project. The use of a free-electron laser facility capable of delivering precisely controlled, broadband X-ray pulses tailored for nonlinear excitation marks the culmination of decades of technological progress. Simultaneously, theoretical frameworks underpinning coherent nonlinear spectroscopy were adapted and expanded to interpret the rich multidimensional data emerging from these experiments.

Looking ahead, the adaptability of the X-ray four-wave mixing technique suggests compelling extensions. By integrating complementary spectroscopic methods and tuning to specific elemental absorption edges, researchers envision dissecting energy flow and electron correlation pathways in increasingly complex heterogeneous systems. Additionally, coupling to quantum information science protocols could leverage coherent X-ray interactions to manipulate quantum states with atomic precision.

Overall, this milestone in coherent nonlinear X-ray spectroscopy illuminates a path toward a unified platform for studying electron dynamics at the fundamental nexus of space and time. The approach’s sensitivity to subtle, resonant electronic couplings offers a powerful toolset for probing and potentially controlling the quantum underpinnings of chemical reactions, phase transitions, and energy transduction processes. As such, it stands poised to influence a broad spectrum of scientific inquiry and technological innovation in the coming years.

Morillo-Candas and colleagues’ research thus encapsulates a new frontier where ultrafast temporal resolution and atomic spatial specificity are harmonized through sophisticated nonlinear X-ray light–matter interactions. Their demonstration not only validates theoretical predictions but also sparks a paradigm shift in how scientists approach the direct observation of transient electronic phenomena. Anticipation is high that this methodology will inspire a wave of research endeavors unlocking the real-time secrets of the quantum world.

In conclusion, the integration of coherent four-photon nonlinear X-ray interactions into the experimental arsenal radically expands the capabilities of ultrafast spectroscopy. It enables a nuanced exploration of electron dynamics with exceptional temporal and spatial clarity, bridging gaps that have long separated domains of physical inquiry. The work represents a significant stride towards fully decoding the complex choreography of electrons that governs a vast array of natural and engineered processes.

Subject of Research: Coherent nonlinear interaction of X-rays with core-shell electrons to investigate ultrafast electron dynamics at atomic resolution.

Article Title: Coherent nonlinear X-ray four-photon interaction with core-shell electrons.

Article References: Morillo-Candas, A.S., Augustin, S., Prat, E. et al. Coherent nonlinear X-ray four-photon interaction with core-shell electrons. Nature 649, 590–596 (2026). https://doi.org/10.1038/s41586-025-09911-1

Image Credits: AI Generated

DOI: 10.1038/s41586-025-09911-1

Keywords: ultrafast spectroscopy, X-ray four-wave mixing, coherent nonlinear optics, free-electron laser, core-shell electrons, electron dynamics, Raman scattering, multidimensional spectroscopy, quantum materials, electron correlation

At the heart of this discovery lies the intricate electronic structure of PtBi₂, a material hosting 12 Weyl cones dispersed in momentum space. These Weyl points act as sources and sinks of Berry curvature, giving rise to surface states known as Fermi arcs. These arcs connect Weyl points in pairs and serve as conduits for electronic transport along the material’s surface. Crucially, when superconductivity sets in, it presents itself not throughout the bulk, but predominantly on the surface states, fundamentally reshaping the system’s low-energy excitations.

To probe this phenomenon theoretically, researchers employed an effective tight-binding model tailored to faithfully represent both lattice symmetries and the spatial arrangement of the Weyl cones in PtBi₂. This modeling approach carefully excludes trivial bands near the Fermi level, thereby isolating the essential physics driving the topological superconducting state. The model reveals that introducing surface superconducting pairing with A₂ symmetry gaps the Fermi arcs, spawning six Majorana cones on each surface of the crystal. These cones represent localized zero-energy excitations that are their own antiparticles, a hallmark of Majorana fermions.

Each Majorana cone is endowed with a nonzero winding number ±1, signaling topological protection guaranteed by the combined presence of time-reversal and particle-hole symmetries. This symmetry-respecting state belongs to class DIII within the Altland-Zirnbauer classification of superconductors, denoting systems that preserve time-reversal symmetry with spin-triplet pairing components. Intriguingly, contrasting with conventional strong topological superconductors, PdBi₂ remains metallic in the bulk and superconductivity emerges solely on the surface, thereby exemplifying a two-dimensional gapless topological phase that is ‘anomalous’.

The anomalous nature is underscored by the asymmetric winding numbers associated with surface Majorana cones: all cones on the top surface exhibit a winding of −1, while their counterparts on the bottom surface carry +1. This unconventional scenario defies realization in purely two-dimensional systems, where the sum of winding numbers cancels and the number of cones must be multiples of four. The delicate balance of topological invariants paints a complex picture of surface superconductivity, emphasizing the crucial role of crystalline symmetries such as threefold rotation and time-reversal symmetry in sustaining this phase.

Breaking time-reversal symmetry, for instance via an external magnetic field, dismantles the topological protection and gaps the Majorana cones, tuning the surface superconducting gap non-uniformly along the Fermi arcs. This prediction opens an experimental window to manipulate and detect signatures of topological superconductivity by investigating changes in the surface spectral gap under weak magnetic perturbations. Remarkably, when time-reversal symmetry is intact, the nontrivial winding numbers guarantee the existence of zero-energy Majorana modes localized at the hinges—where distinct crystal surfaces meet—thus extending the topological character of the system beyond purely planar geometries.

Computational studies on prism-shaped geometries of PtBi₂ support this framework by demonstrating hinge-localized zero modes arising between projections of Majorana cones from the top and bottom surfaces. The hinge modes occupy specific ranges of crystal momentum where the total winding number adds to ±2, and vanish or split away from zero energy outside these regions. As with the surface cones, these hinge states are sensitive to magnetic fields, shifting away from zero energy upon breaking time-reversal symmetry. This interplay between magnetic tuning and topological localization offers a concrete experimental signature accessible through advanced local probes at crystal edges.

Unraveling the microscopic origin of the unconventional i-wave pairing symmetry remains a compelling frontier. Unlike cuprate superconductors, where strong electron-electron interactions favor nodal d-wave channels, PtBi₂ exhibits highly delocalized electronic states with weak correlation effects. This suggests that conventional interaction-driven mechanisms may not explain the nodal superconductivity on its Fermi arcs. Instead, the robust topological character of these surface states likely plays a pivotal role, potentially leveraging nontrivial spin-momentum locking or other exotic effects inherent to Weyl physics. Deciphering this pairing mechanism promises to deepen our understanding of superconductivity emerging from topological electronic structures.

Despite the profound fundamental insights, the coexistence of gapless Majorana cones with a metallic normal-state bulk imposes significant challenges for leveraging PtBi₂ into quantum computing platforms. The presence of bulk modes undermines the isolation of topological quasiparticles, which are essential for fault-tolerant quantum operations. Nevertheless, the fabrication of ultrathin samples presents a promising route to mitigate unwanted bulk contributions, possibly isolating the desired surface superconducting phase. Moreover, engineering time-reversal symmetry breaking could stabilize gapped surface states harboring chiral Majorana edge modes or localized zero-dimensional Majorana bound states at corners—both widely advocated as building blocks for topological quantum computation.

Additionally, controlling the relative phase between the superconducting order parameters on the top and bottom surfaces introduces the tantalizing prospect of creating a planar Josephson junction within a single crystalline framework. Such junctions can harbor exotic Andreev bound states with nontrivial topological character, potentially functioning as qubits or topologically protected quantum gates. This sophisticated level of control would harness the inherent material symmetries and topological properties of PtBi₂ to engineer novel functionalities beyond what conventional superconductors can offer.

This comprehensive study not only spotlights PtBi₂ as a fertile platform to investigate a new class of nodal topological superconductors but also pushes the envelope of how symmetry, topology, and superconductivity intertwine in real materials. The confluence of theoretical modeling and experimental feasibility underscores the broader impact, aiding the design of future quantum devices that exploit surface-localized Majorana modes and hinge-localized states for robust and scalable quantum computation.

As research in this arena accelerates, the synergistic exploration of surface superconductivity, topological protection, and symmetry breaking promises to revolutionize our understanding of emergent quantum phases. PtBi₂ stands at the forefront, offering an unprecedented opportunity to meld fundamental physics with applied quantum technology, potentially ushering in the next generation of quantum materials and devices.

Subject of Research: Topological nodal i-wave superconductivity in Weyl semimetal PtBi₂.

Article Title: Topological nodal i-wave superconductivity in PtBi₂.

Article References: Changdar, S., Suvorov, O., Kuibarov, A. et al. Nature 647, 613–618 (2025). https://doi.org/10.1038/s41586-025-09712-6

Image Credits: AI Generated

DOI: 20 November 2025

Recently, a team of researchers at the Massachusetts Institute of Technology has ventured to answer this challenging question by establishing a comprehensive evaluative framework designed not only to quantify the quantum properties of materials but also to assess their economic and environmental viability. Their pioneering study scrutinizes over 16,000 quantum materials, combining advanced computational techniques with pragmatic assessments of cost, supply chain robustness, and environmental impact. This multidimensional approach moves beyond traditional metrics, offering a holistic view that may transform how quantum materials are selected for further development and industrial scaling.

At the heart of this evaluation lies the concept of “quantum weight,” a parameter rooted in quantum physics that measures the intensity of quantum fluctuations within the electron centers of a material. Formulated on theoretical foundations laid by MIT professor Liang Fu, quantum weight serves as a quantitative index of a material’s intrinsic “quantumness.” Higher quantum weight implies more pronounced quantum mechanical effects, which often translate to enhanced or novel functionalities desired in advanced technologies. Nonetheless, the research unveiled a disconcerting trend: materials exhibiting higher quantum weight generally correspond to elevated costs and significant environmental footprints, complicating their path to commercialization.

This correlation between quantum weight and both economic expense and ecological burden is pivotal. For industry stakeholders, the feasibility of adopting new materials is strongly influenced by these factors. The researchers observed that materials with exceptional quantum properties frequently contain rare or environmentally harmful elements, leading to expensive extraction and processing methods that are difficult to scale sustainably. For scientists principally engrossed in uncovering exotic quantum phenomena, this sobering insight emphasizes the necessity of reconciling fundamental research with practical constraints.

The framework developed by the MIT team systematically integrates data reflecting mining practices, elemental availability, and supply chain resilience into a computable algorithm, thus assigning each material an environmental impact score alongside its price and quantum weight. This data-driven method identified approximately 200 quantum materials that are comparatively sustainable, suggesting promising avenues for industrial application. A meticulous refinement of this subset yielded 31 materials exhibiting an optimal balance of quantum functionality and sustainability, poised as prime candidates for experimental validation and potential technology transfer.

This approach marks a conceptual shift in quantum materials research. Mingda Li, associate professor of nuclear science and engineering and the study’s senior author, underscores the cultural divide that often separates material science from economic and environmental considerations. Traditionally, the field has emphasized the nuances of quantum physics at the expense of pragmatic factors such as cost or ecological impact, which some researchers have viewed as peripheral or subjective. Li advocates for integrating these “soft” factors into the scientific discourse, predicting that within the next decade, comprehensive assessments encompassing cost and sustainability will become standard practice in material development pipelines.

The implications of this work extend beyond academic curiosity, touching upon the future of technology itself. Topological materials—a subclass of quantum materials with unique electronic characteristics exploited in quantum computing, spintronics, and next-generation photovoltaics—featured prominently in the study. Their innate electronic robustness against defects and disorder theoretically enables revolutionary performance improvements. Yet, their synthesis and scalability have long been bottlenecked by economic and environmental constraints, a gap this new framework helps to elucidate and potentially bridge.

Experimental validation remains a critical next step. Many materials identified in the study have yet to be synthesized in a laboratory setting, posing challenges for precise evaluation of their performance characteristics and manufacturability. However, dialogue between the researchers and industry representatives has already commenced, with semiconductor companies expressing keen interest in exploring these newly spotlighted candidates. Collaborative efforts aim to experimentally characterize these promising materials, evaluating their performance metrics against the cost and sustainability benchmarks the framework has established.

Beyond electronics, the potential applications of sustainable quantum materials are vast and transformative. For instance, topological materials possess theoretical energy conversion efficiencies nearing 89 percent, far surpassing the 34 percent Shockley-Queisser limit of traditional solar cells. Their ability to harvest energy across a broad spectrum of electromagnetic waves—including thermal energy emitted by the human body—opens pathways for innovative energy harvesting technologies. This could culminate in personal devices that recharge simply through ambient body heat, revolutionizing the landscape of wearable technology and portable electronics.

This study also serves as a call to action for the materials science community. By highlighting the importance of environmental and economic factors in the material selection process, it aims to direct research efforts towards materials that not only exhibit fascinating quantum phenomena but also hold tangible promise for industrial adoption. Such a paradigm could accelerate the translation of quantum research from the laboratory bench to real-world applications, driving innovation while mitigating negative environmental consequences.

The methodology underpinning this research exemplifies the power of artificial intelligence in materials science. Leveraging machine learning algorithms developed by the MIT group, the team quantified quantum behaviors and correlated them to sustainability metrics, illustrating how computational tools can greatly enhance predictive capabilities. This AI-guided approach represents an emerging frontier in materials discovery where large datasets converge with theory to rapidly identify viable candidates, reducing the experimental burden and expediting development cycles.

In addition to its scientific contributions, the study underscores the necessity of interdisciplinary collaboration. The team comprises researchers from nuclear science, physics, electrical engineering, materials science, and chemistry, representing a convergence of expertise. Engaging with industrial partners further cements the practical orientation of this research, ensuring that theoretical breakthroughs align with real-world challenges and opportunities, a model that may well define the future of quantum materials research.

This work received support from the U.S. National Science Foundation and the Department of Energy, emphasizing the growing recognition of sustainable quantum materials as a strategic priority. As research evolves, the integration of economic and environmental considerations with quantum material science is poised to reshape the trajectory of technological innovation, enabling a future where the exotic meets the practical, and quantum advances enrich society sustainably.

Subject of Research: Quantum materials, evaluation of economic and environmental sustainability of quantum materials.

Article Title: “Are quantum materials economically and environmentally sustainable?”

Web References: http://dx.doi.org/10.1016/j.mattod.2025.09.014

Keywords: Quantum mechanics, Quantum dynamics, Quantum computing, Computational science, Materials science, Materials engineering, Superconductivity, Electrical properties