Kagome superconductors AV3Sb5 (A = K, Rb, Cs)

Kun Jiang; Tao Wu; Jia-Xin Yin; Zhenyu Wang; M Zahid Hasan; Stephen D Wilson; Xianhui Chen; Jiangping Hu

doi:10.1093/nsr/nwac199

Kagome superconductors AV₃Sb₅ (A = K, Rb, Cs)

Natl Sci Rev. 2022 Sep 27;10(2):nwac199. doi: 10.1093/nsr/nwac199. eCollection 2023 Feb.

Authors

Kun Jiang^{1

2}, Tao Wu^{3

4}, Jia-Xin Yin⁵, Zhenyu Wang⁴, M Zahid Hasan⁵, Stephen D Wilson⁶, Xianhui Chen^{3

4}, Jiangping Hu^{1

7}

Affiliations

¹ Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
² School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.
³ Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.
⁴ CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei 230026, China.
⁵ Laboratory for Quantum Emergence, Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China.
⁶ Materials Department and California Nanosystems Institute, University of California Santa Barbara, Santa Barbara, CA 93106, USA.
⁷ Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.

Abstract

The quasi-two-dimensional kagome materials AV₃Sb₅ (A = K, Rb, Cs) were found to be a prime example of kagome superconductors, a new quantum platform to investigate the interplay between electron correlation effects, topology and geometric frustration. In this review, we report recent progress on the experimental and theoretical studies of AV₃Sb₅ and provide a broad picture of this fast-developing field in order to stimulate an expanded search for unconventional kagome superconductors. We review the electronic properties of AV₃Sb₅, the experimental measurements of the charge density wave state, evidence of time-reversal symmetry breaking and other potential hidden symmetry breaking in these materials. A variety of theoretical proposals and models that address the nature of the time-reversal symmetry breaking are discussed. Finally, we review the superconducting properties of AV₃Sb₅, especially the potential pairing symmetries and the interplay between superconductivity and the charge density wave state.

Keywords: charge density wave; kagome superconductor; time-reversal symmetry breaking; topological metal.

Publication types

Review