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Source: Fig. 1, S. Shao et al., Physical Review Letters 136, 156101 (2026).
Copyright: © 2026 American Physical Society.
Interlayer Charge-Density-Wave Vector Phase Induced Structural Chirality
Interlayer Charge-Density-Wave Vector Phase Induced Structural Chirality
Sen Shao†, Wei-Chi Chiu†, et al.
Physical Review Letters 136, 156101 (2026). † Co-first authors.
Chiral charge-density-wave order can emerge from relative phases of CDW vectors between adjacent layers. Using first-principles calculations, we showed that this overlooked interlayer phase degree of freedom drives chiral structural distortions, reproduces measured electronic and optical responses, and offers a route to tune chirality through electron filling.
Source: Panel from Fig. 2 (cropped excerpt), W.-C. Chiu et al., ACS Nano 19, 18108–18116 (2025).
Copyright / license: © 2025 The Authors. Licensed under CC BY-NC-ND 4.0; published by the American Chemical Society.
Strain-Induced Charge Density Waves with Emergent Topological States in Monolayer NbSe2
Strain-Induced Charge Density Waves with Emergent Topological States in Monolayer NbSe2
Wei-Chi Chiu, Sougata Mardanya, Robert Markiewicz, Jouko Nieminen, Bahadur Singh, Tugrul Hakioglu, Amit Agarwal, Tay-Rong Chang, Hsin Lin, Arun Bansil
ACS Nano 19, 18108–18116 (2025).
Using first-principles calculations, we showed that modest biaxial tensile strain stabilizes two competing 2×2 charge-density-wave phases in monolayer 1H-NbSe2. These phases generate topological states absent from the pristine material, including Z2 topology, mirror-Chern phases, nodal lines, and higher-order topology. Edge and corner-state calculations reveal how strain-controlled charge order can create robust electronic states in an initially topologically trivial material.
Source: Fig. 3, M. Kadek et al., Physical Review Materials 7, 064001 (2023).
Copyright: © 2023 American Physical Society.
Relativistic Band Topology in Two-Dimensional and Crystalline Materials
Relativistic Band Topology in Two-Dimensional and Crystalline Materials
First-principles electronic structure connects spin–orbit coupling and crystalline symmetry to topological band phases. Our work treats the relativistic band structures and Z2 invariants of two-dimensional transition-metal dichalcogenides, alongside complementary predictions of topological crystalline-insulator states and type-II surface Dirac fermions in transition-metal dipnictides.
Marius Kadek, Baokai Wang, Marc Joosten, Wei-Chi Chiu, et al., Band Structures and Z2 Invariants of Two-Dimensional Transition Metal Dichalcogenide Monolayers from Fully Relativistic Dirac–Kohn–Sham Theory Using Gaussian-Type Orbitals, Physical Review Materials 7, 064001 (2023).
Baokai Wang, Bahadur Singh, Barun Ghosh, Wei-Chi Chiu, et al., Topological Crystalline Insulator State with Type-II Dirac Fermions in Transition Metal Dipnictides, Physical Review B 100, 205118 (2019).
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