quantum phenomena in nanomaterials – Science

Kono Honored with American Physical Society’s Isakson Prize

Katie Riggs — Wed, 05 Nov 2025 18:23:38 +0000

In a landmark recognition that underscores the frontriers of optical physics and condensed matter science, Rice University’s distinguished physicist, Junichiro Kono, has been awarded the 2026 Frank Isakson Prize for Optical Effects in Solids by the American Physical Society. This prestigious biennial accolade honors revolutionary contributions in optical research that have propelled transformative breakthroughs in solid-state physics. Kono’s trailblazing work delves deeply into the interactions between light and matter at the nanoscale, unlocking novel quantum phenomena and establishing foundational principles for the next wave of photonic technologies.

Kono’s research agenda focuses on how photons engage with artificially engineered quantum structures and carbon-based nanomaterials, harnessing ultra-precise spectroscopic techniques to reveal interactions previously thought impossible. One of the hallmark achievements includes the first experimental observation of superfluorescence originating in a solid medium—a process where a large ensemble of excited atoms emit light cooperatively, enhancing intensity and coherence dramatically. This discovery alone reshaped understanding about collective light emission mechanisms in condensed matter systems and opened avenues for developing potent ultrafast light sources.

Furthermore, Kono’s group made seminal contributions to understanding quantum behaviors in carbon nanotubes subjected to intense magnetic fields. These cylindrical carbon nanostructures, celebrated for their exceptional electrical and optical properties, revealed subtle quantum effects under magnetic influences that dramatically alter their electronic states. Such insights pave the way for manipulating quantum states in low-dimensional matter, vital for components in quantum computing and spintronics.

Central to Kono’s portfolio is the exploration of ultrastrong coupling between light and matter within terahertz-frequency cavities—a domain encompassed by cavity quantum electrodynamics (QED). This field investigates how confining electromagnetic fields in nanoscale resonators can profoundly modify a material’s intrinsic properties, effectively enabling vacuum electromagnetic fluctuations to influence matter without any external photon injection. This radical paradigm promises revolutionary control over material behaviors, including tuning superconductivity or magnetism via engineered photonic environments.

The significance of Kono’s achievements lies not only in the fundamental physics but also the application prospects. His insights hold promise for innovative technologies ranging from ultra-efficient electronics to advanced quantum communication networks and sensors operating at the zenith of physical precision. The interplay of light and nanoscale materials that Kono’s research elucidates is a keystone for emerging devices capable of harnessing quantum coherence and entanglement in practical ways.

Beyond the flourishing research, Kono exemplifies academic leadership as the Karl F. Hasselmann Chair in Engineering at Rice University. His appointments span electrical and computer engineering, physics and astronomy, and materials science and nanoengineering, illustrating the deeply interdisciplinary nature of his work. He also steers the Smalley-Curl Institute, fostering a collaborative hub for cutting-edge research at Rice.

Highlighting Kono’s commitment to nurturing the next generation of scientists, he has spearheaded international educational programs such as NanoJapan and TOMODACHI STEM@Rice. These initiatives provide invaluable cross-cultural research experiences for students from the U.S. and Japan, catalyzing global scientific collaboration at a critical time when interdisciplinary and international approaches are imperative.

The Frank Isakson Prize itself memorializes physicist Frank Isakson and is traditionally conferred in even-numbered years to honor transformative research in optical effects within solids. Kono’s receipt of this prize reflects not only his seminal individual contributions but the collective intellectual momentum of his research team and collaborators.

Kono’s pioneering optical experiments leverage state-of-the-art techniques capable of probing ultrafast dynamics and interactions invisible to conventional methods. For instance, time-resolved spectroscopy under extreme electromagnetic conditions unveils transient quantum states that hold keys to new materials’ functionalities. This expertise places his team at the forefront of condensed matter physics, blending theory and experiment to unravel complex photonic and electronic phenomena.

The notion of ultrastrong light-matter coupling explored in Kono’s work represents a quantum regime where the interaction strength rivals the system’s resonant frequencies, fundamentally reconfiguring energy levels and quantum states. This regime challenges and extends traditional quantum optics frameworks, demanding sophisticated quantum electrodynamics models and offering unprecedented control over material and photonic systems.

By integrating quantum optics principles with nanomaterial engineering, Kono’s research bridges several domains, including photonics, condensed matter physics, and materials science. This cross-pollination is essential for realizing functional quantum devices that can overcome limitations of classical technologies and herald new applications in computation, secure communication, and sensing with ultra-high sensitivity.

Ultimately, Kono’s recognition by the American Physical Society underscores the transformative power of curiosity-driven research. His reflections emphasize the collaborative spirit in scientific discovery and the boundless potential when talented minds pioneer uncharted physical landscapes. As optical technologies become central to future technological revolutions, Kono’s work marks a guiding beacon illuminating the fusion of light and matter at nature’s smallest scales.

Subject of Research: Optical physics of nanoscale materials, light-matter interactions, and cavity quantum electrodynamics in condensed matter systems.

Article Title: Junichiro Kono Honored with the 2026 APS Frank Isakson Prize for Pioneering Optical Research in Nanoscale Quantum Systems

News Publication Date: November 5, 2025

Web References:
https://news.rice.edu/

Image Credits: Photo by Jorge Vidal/Rice University

Keywords

Physics, Condensed matter physics, Light matter interactions, Cavity quantum electrodynamics, Optics, Optical trapping, Optical properties, Quantum optics, Semiconductors, Materials, Nanomaterials, Materials engineering, Two dimensional materials, Thin films

Scientists Cultivate Pencil-Shaped Gold “Quantum Needles” in Breakthrough Discovery

Katie Riggs — Fri, 05 Sep 2025 04:16:18 +0000

In a groundbreaking advancement poised to revolutionize nanotechnology and biomedical imaging, a team of researchers from the University of Tokyo has unveiled unprecedented insights into the structural evolution of gold nanoclusters in their embryonic stages. Led by Principal Investigator Tatsuya Tsukuda, along with Shinjiro Takano and Yuya Hamasaki, this research charts a meticulous course through the nucleation and anisotropic growth of gold clusters, culminating in the discovery of a novel form they’ve termed “gold quantum needles.” Published in the Journal of the American Chemical Society, these findings not only illuminate the fundamental processes underlying nanocluster formation but also hint at transformative applications in high-resolution imaging and energy conversion technologies.

Gold, often associated with ornamental or financial value, possesses unique attributes at the nanoscale, where its physical and chemical properties diverge dramatically from its bulk counterpart. Specifically, gold nanoclusters composed of fewer than 100 atoms exhibit quantum phenomena that are highly sensitive to their geometry and electronic structure. However, controlling the synthesis of such clusters with precise size, shape, and composition has remained a formidable challenge in nanochemistry, partly due to a limited understanding of the early-stage growth mechanisms that dictate their final morphology.

Recognizing this gap, the research team engineered atypical synthesis conditions designed to trap gold clusters at their seminal growth stages. Employing single-crystal X-ray diffraction—a technique that deciphers atomic arrangements within crystalline materials—they unveiled that gold nanoclusters don’t simply grow uniformly but do so anisotropically, expanding at different rates along different axes. This deviation from isotropic growth defies simplistic assumptions and provides a fresh perspective on how nanocluster shape can be directed through manipulation of growth kinetics.

Perhaps most strikingly, the investigations revealed a previously unobserved structural motif: elongated, pencil-shaped nanoclusters constructed from triangular trimers and tetrahedral tetramers of gold atoms. These structures, named “gold quantum needles,” display quantized electronic behavior arising from the confinement of electrons within their unique geometry. In quantum mechanics, such confinement leads to discrete energy states, which are central to the unprecedented optical properties these nanoclusters exhibit — especially their responsiveness to near-infrared light.

This responsiveness to near-infrared wavelengths is not merely a scientific curiosity but carries profound implications. Near-infrared light penetrates biological tissues more deeply and with less damage compared to visible light, making gold quantum needles promising agents for next-generation biomedical imaging techniques. Their ability to interact with light efficiently positions them as excellent candidates for enhancing imaging resolution or even facilitating light-driven therapeutic interventions, a pursuit that remains at the forefront of medical nanotechnology.

Exploring the genesis of these quantum needles, Tsukuda elaborates that their formation diverges markedly from the conventional spherical clusters typically observed during gold nanocluster synthesis. Instead of a compact, roughly spherical geometry, these clusters initiate with a triangular base of three gold atoms, setting a foundation for anisotropic elongation. This serendipitous discovery underscores how subtle alterations in experimental conditions can yield entirely new structural classes, expanding the creative toolbox of materials scientists.

The study’s deeper significance lies in its contribution to demystifying the so-called “black box” of nanocluster formation. Prior to this work, the precise nucleation dynamics and the pathways favoring different morphologies were largely speculative. By providing “structural snapshots” of clusters at various growth phases, the research charts a detailed map of how tiny gold seeds transform stepwise into complex architectures. This not only enables predictive control over cluster design but also unlocks the potential for tuning electronic and optical properties with unprecedented accuracy.

According to the team, the refined synthesis protocols employed here involve controlled reduction of gold precursor ions in the presence of protective thiolate ligands. These surface ligands safeguard nascent clusters from uncontrolled aggregation and provide an interactive platform influencing growth directionality. The intricate interplay between ligand chemistry and gold atom assembly is pivotal in steering cluster anisotropy and dimensionality.

Going beyond mere observation, the researchers envision leveraging this newfound understanding to engineer other novel gold-based nanostructures with tailored optoelectronic properties. Future endeavors include refining the synthetic parameters to access a broader spectrum of shapes and sizes, potentially leading to materials with customized responses for specific applications, such as catalysis, sensing, or photonics.

In addition, interdisciplinary collaborations are on the horizon to harness the remarkable optical capabilities of gold quantum needles. Their near-infrared absorption efficiency, combined with quantum confinement effects, makes them ideal candidates for integration into biomedicine, particularly in techniques requiring deep tissue penetration or localized photothermal therapies. The team is optimistic about translating these fundamental insights into practical technologies that could redefine diagnostic and therapeutic paradigms.

This research represents a synthesis of advanced experimental techniques and conceptual innovation, bridging a significant gap between theoretical understanding and practical synthesis of functional nanomaterials. By illustrating the anisotropic nucleation and stepwise growth of these gold clusters, the study sets a benchmark for future investigations seeking to manipulate matter at the atomic scale with surgical precision.

Ultimately, the emergence of gold quantum needles embodies a paradigm shift in nanochemistry, opening avenues not just for academic inquiry but for impactful applications that harness the intersection of quantum physics, materials science, and biomedical engineering. The journey from the nucleation of three gold atoms to fully formed quantum needles heralds a new chapter where the deliberate design of nanomaterials transcends previous limitations, offering a robust platform for innovation.

Subject of Research: Not applicable

Article Title: X-ray Crystallographic Visualization of a Nucleation and Anisotropic Growth in Thiolate-Protected Gold Clusters: Toward Targeted Synthesis of Gold Quantum Needles

News Publication Date: 5-Sep-2025

Web References: http://dx.doi.org/10.1021/jacs.5c11089

Image Credits: Takano et al 2025

Keywords

Gold nanoclusters, anisotropic growth, nucleation, quantum needles, single-crystal X-ray diffraction, near-infrared optical properties, nanotechnology, quantum confinement, thiolate ligands, nanomaterials synthesis, biomedical imaging, photothermal therapy