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Title: Electronic nature of chiral charge order in the kagome superconductor CsV₃Sb₅
Authors: Wang, Zhiwei
Jiang, Yu-Xiao
Yin, Jia-Xin
Li, Yongkai
Wang, Guan-Yong
Huang, Hai-Li
Shao, Sen
Liu, Jinjin
Zhu, Peng
Shumiya, Nana
Md Shafayat Hossain
Liu, Hongxiong
Shi, Youguo
Duan, Junxi
Li, Xiang
Chang, Guoqing
Dai, Pengcheng
Ye, Zijin
Xu, Gang
Wang, Yanchao
Zheng, Hao
Jia, Jinfeng
M. Zahid Hasan
Yao, Yugui
Keywords: Science::Physics
Issue Date: 2021
Source: Wang, Z., Jiang, Y., Yin, J., Li, Y., Wang, G., Huang, H., Shao, S., Liu, J., Zhu, P., Shumiya, N., Md Shafayat Hossain, Liu, H., Shi, Y., Duan, J., Li, X., Chang, G., Dai, P., Ye, Z., Xu, G., ...Yao, Y. (2021). Electronic nature of chiral charge order in the kagome superconductor CsV₃Sb₅. Physical Review B, 104(7), 075148-.
Project: 020375-00001
Journal: Physical Review B 
Abstract: Kagome superconductors with TC up to 7 K have been discovered for over 40 y. Recently, unconventional chiral charge order has been reported in kagome superconductor KV3Sb5, with an ordering temperature of one order of magnitude higher than the TC. However, the chirality of the charge order has not been reported in the cousin kagome superconductor CsV3Sb5, and the electronic nature of the chirality remains elusive. In this paper, we report the observation of electronic chiral charge order in CsV3Sb5 via scanning tunneling microscopy (STM). We observe a 2 × 2 charge modulation and a 1 × 4 superlattice in both topographic data and tunneling spectroscopy. 2 × 2 charge modulation is highly anticipated as a charge order by fundamental kagome lattice models at van Hove filling, and is shown to exhibit intrinsic chirality. We find that the 1 × 4 superlattices form various small domain walls, and can be a surface effect as supported by our first-principles calculations. Cru- cially, we find that the amplitude of the energy gap opened by the charge order exhibits real-space modulations, and features 2 × 2 wave vectors with chirality, highlighting the electronic nature of the chiral charge order. STM study at 0.4 K reveals a superconducting energy gap with a gap size 2􏰀 = 0.85 meV , which estimates a moderate superconductivity coupling strength with 2􏰀/kBTC = 3.9. When further applying a c-axis magnetic field, vortex core bound states are observed within this gap, indicative of clean-limit superconductivity.
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.104.075148
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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