A groundbreaking study led by Associate Professor Cao Liang at the Hefei Institutes of Physical Science, Chinese Academy of Sciences, unveils a novel method to engineer quantum states in two-dimensional materials by exploiting controlled interlayer sliding. This approach centers on manipulating the relative positioning of atomic layers, enabling researchers to design superlattices with programmable electronic properties through precise structural tailoring.
Van der Waals materials, known for their layered atomic structure where strong in-plane bonds contrast with weak interlayer interactions, allow atomic layers to slide over one another. This characteristic forms the foundation for tuning electronic behavior by altering stacking sequences without disrupting the integrity of individual layers. Among these materials, tantalum disulfide (TaS₂) stands out due to its rich array of quantum phases, including charge-density waves, Mott insulating states, and superconductivity. However, the challenge persists in controlling these phases through structural modifications.
Building on previous insights, Cao’s team engineered periodic superlattices in bulk 1T-TaS₂ crystals by methodically adjusting the stacking configuration between layers. These superlattices exhibited the capacity to switch insulating states by reconfiguring the interlayer registry, providing a new paradigm for understanding and controlling electron correlation phenomena in this material. The work was augmented by experiments conducted under intense magnetic fields using the Steady High Magnetic Field Facility.
Further investigations revealed that combining layer sliding with atomic rearrangements catalyzes phase transformations between distinct structural forms of TaS₂, notably transitions involving the 1T and 1H polytypes. The resultant heterophase superlattices integrate multiple electronic phases in an ordered framework, leading to unique superconducting behaviors not observed in uniform phases. This demonstrates the profound influence of interlayer stacking on the emergent quantum properties.
Crucially, the study posits that stacking sequences could act as a structural “code,” enabling the programmable design of quantum states. By controlling interlayer displacement and atomic coordination, it becomes possible to orchestrate the electronic landscape, paving the way for custom-built materials with tailored functionalities. Such adaptability holds promise for next-generation quantum devices relying on two-dimensional materials.
This work exemplifies how mechanical manipulation at the atomic scale can serve as a versatile tool for quantum material design, bridging the gap between structural engineering and electronic phenomena. The implications extend to tunable superconductivity and electron correlation control, vital for technologies based on quantum information science and nanoscale electronics.
Published in National Science Review, the research underscores the unexplored potential of layered materials when combined with precise interlayer mechanical control. It reveals a new horizon in condensed matter physics, where sliding atomic layers become active elements in the engineering of complex quantum phases.
This innovative strategy not only enriches fundamental understanding but also lays the groundwork for practical advances in material science, fostering the development of programmable quantum materials and adaptive electronic systems.
Subject of Research: Engineering quantum states in layered materials via controlled interlayer sliding
Article Title: Self-adaptive hetero-phase superlattices in TaS2 via layer-resolved 1T-to-1H transformations
News Publication Date: 26-Apr-2026
Web References: 10.1093/nsr/nwag246
Image Credits: CAO Liang
Keywords
Physical sciences, quantum materials, 2D materials, superlattices, TaS2, interlayer sliding, phase transformation, superconductivity
