Spectroscopic visualization and phase manipulation of chiral charge density waves in 1T-TaS2

Yan Zhao, Zhengwei Nie, Hao Hong, Xia Qiu, Shiyi Han, Yue Yu, Mengxi Liu, Xiaohui Qiu, Kaihui Liu, Sheng Meng (), Lianming Tong () and Jin Zhang
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Yan Zhao: Peking University
Zhengwei Nie: Chinese Academy of Sciences
Hao Hong: Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University
Xia Qiu: Peking University
Shiyi Han: Peking University
Yue Yu: Peking University
Mengxi Liu: University of Chinese Academy of Sciences
Xiaohui Qiu: University of Chinese Academy of Sciences
Kaihui Liu: Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University
Sheng Meng: Chinese Academy of Sciences
Lianming Tong: Peking University
Jin Zhang: Peking University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract The chiral charge density wave is a many-body collective phenomenon in condensed matter that may play a role in unconventional superconductivity and topological physics. Two-dimensional chiral charge density waves provide the building blocks for the fabrication of various stacking structures and chiral homostructures, in which physical properties such as chiral currents and the anomalous Hall effect may emerge. Here, we demonstrate the phase manipulation of two-dimensional chiral charge density waves and the design of in-plane chiral homostructures in 1T-TaS2. We use chiral Raman spectroscopy to directly monitor the chirality switching of the charge density wave—revealing a temperature-mediated reversible chirality switching. We find that interlayer stacking favours homochirality configurations, which is confirmed by first-principles calculations. By exploiting the interlayer chirality-locking effect, we realise in-plane chiral homostructures in 1T-TaS2. Our results provide a versatile way to manipulate chiral collective phases by interlayer coupling in layered van der Waals semiconductors.

Date: 2023
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DOI: 10.1038/s41467-023-37927-6

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