Chiral charge density wave induced by mirror symmetry breaking in kagome metal

Jing Liu; Wen-Feng Wu; Qing-Wei Wang; Xiao-Cheng Bai; Zhi Zeng; Liang-Jian Zou

doi:10.1088/1361-648X/ad0cae

Chiral charge density wave induced by mirror symmetry breaking in kagome metal

J Phys Condens Matter. 2023 Nov 23;36(9). doi: 10.1088/1361-648X/ad0cae.

Authors

Jing Liu¹, Wen-Feng Wu^{1

2}, Qing-Wei Wang^{3

4}, Xiao-Cheng Bai^{1

2}, Zhi Zeng^{1

2}, Liang-Jian Zou^{1

2}

Affiliations

¹ Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, PO Box 1129, Hefei 230031, People's Republic of China.
² Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, People's Republic of China.
³ School of Information Engineering, Zhejiang Ocean University, Zhoushan, Zhejiang 316022, People's Republic of China.
⁴ Key Laboratory of Oceanographic Big Data Mining & Application of Zhejiang Province, Zhejiang Ocean University, Zhoushan, Zhejiang 316022, People's Republic of China.

PMID: 37964592
DOI: 10.1088/1361-648X/ad0cae

Abstract

Kagome lattice provides a distinctive platform to investigate various correlated electron orders. Recently, an unconventional charge density wave (CDW) with novel chirality is observed in the kagome metalAV₃Sb₅(A= K, Rb, Cs), and the origin of which is still unclear. Here, using a tight-binding model and the mean-field method, we calculate the electron order in the quasi-two-dimensional kagome lattice with 1/3 electron filling, and show that the chiral CDW emerges under a set of parameters withC6rotational symmetry but without mirror symmetry. Physically, the reason why we choose this set of parameters is based on the possible tangential distortion of the kagome lattice. Our results provide a fresh insight to understand the microscopic origin of the unconventional CDW inAV₃Sb₅.

Keywords: charge density wave; chirality; kagome lattice; symmetry breaking; tight-binding model.