@article{4c05cb1afc424d5e9bf9f1e9ab8f21ce,
title = "Electronic nature of chiral charge order in the kagome superconductor Cs V3Sb5",
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. Crucially, 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 2Δ=0.85meV, which estimates a moderate superconductivity coupling strength with 2Δ/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.",
author = "Zhiwei Wang and Jiang, {Yu Xiao} and Yin, {Jia Xin} and Yongkai Li and Wang, {Guan Yong} and Huang, {Hai Li} and Shen Shao and Jinjin Liu and Peng Zhu and Nana Shumiya and Hossain, {Md Shafayat} and Hongxiong Liu and Youguo Shi and Junxi Duan and Xiang Li and Guoqing Chang and Pengcheng Dai and Zijin Ye and Gang Xu and Yanchao Wang and Hao Zheng and Jinfeng Jia and Hasan, {M. Zahid} and Yugui Yao",
note = "Funding Information: The work at Beijing Institute of Technology was supported by the National Key R&D Program of China (Grant No. 2020YFA0308800), the Natural Science Foundation of China (Grants No. 92065109, No. 11734003, and No. 12061131002), the Beijing Natural Science Foundation (Grant No. Z190006), and the Beijing Institute of Technology (BIT) Research Fund Program for Young Scholars (Grant No. 3180012222011). Z.W. thanks the Analysis & Testing Center at BIT for assistance in facility support. Experimental and theoretical work at Princeton University was supported by the Gordon and Betty Moore Foundation [Grants No. GBMF4547 and No. GBMF9461 (M.Z.H.)]. Y.S. was supported by the National Natural Science Foundation of China (Grant No. U2032204), and the K. C. Wong Education Foundation (Grant No. GJTD-2018-01). G.C. would like to acknowledge the support of the National Research Foundation, Singapore under its NRF Fellowship Award No. NRF-NRFF13-2021-0010 and the Nanyang Assistant Professorship grant from Nanyang Technological University. P.D. is supported the U.S. Department of Energy (DOE), Basic Energy Sciences (BES), under Contract No. DE-SC0012311. S.S. and Y.W. were supported by the National Natural Science Foundation of China under Grants No. 11822404 and No. 11774127. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",
year = "2021",
month = aug,
day = "15",
doi = "10.1103/PhysRevB.104.075148",
language = "English (US)",
volume = "104",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "7",
}