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    Interlayer Charge-Density-Wave Vector Phase Induced Structural Chirality

    Sen Shao1,*, Wei-Chi Chiu2,3,*, Tao Hou1, Naizhou Wang1, Ilya Belopolski4, Yilin Zhao1, Jinyang Ni1, Qi Zhang5, Yongkai Li6,7,8 et al.

    Jinjin Liu6,7,8, Mohammad Yahyavi1, Yuanjun Jin1, Qiange Feng1,9, Peiyuan Cui1, Cheng-Long Zhang10, Yugui Yao6,7, Zhiwei Wang6,7,8, Jia-Xin Yin9, Su-Yang Xu11, Qiong Ma12,13, Wei-bo Gao1, Md Shafayat Hossain14,15,16, Arun Bansil2,3,†, and Guoqing Chang1,‡

    • *These authors contributed equally to this work.
    • †Contact author: ar.bansil@northeastern.edu
    • ‡Contact author: guoqing.chang@ntu.edu.sg

    Phys. Rev. Lett. 136, 156101 – Published 14 April, 2026

    DOI: https://doi.org/10.1103/tj3h-sh7q

    Abstract

    Chiral charge density waves (CDWs) have attracted intense interest due to their exotic quantum properties, yet the microscopic origin of structural chirality emerging from correlated charge order remains elusive. Here, we reveal that the interlayer phases of CDW vectors, an overlooked degree of freedom, play a crucial role in driving chiral structural displacements in layered CDW materials. By explicitly incorporating the interlayer phases in first-principles calculations, we successfully obtained the chiral structure of the CDW phases of AV3Sb5 (A=K, Rb, and Cs) and 1T−TiSe2. The electronic and optical properties of the predicted chiral structures are consistent with experimental measurements of these materials in their CDW phases. We further predict that 1T−NbSe2 is a promising material candidate for realizing chiral CDW order. Beyond materials prediction, our theory reveals that the chiral CDW can be manipulated by electron filling. Our Letter opens new avenues for discovering, designing, and engineering chiral CDW materials.

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