Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe

作     者：Jia-Xin Yin Yu-Xiao Jiang Xiaokun Teng Md. Shafayat Hossain Sougata Mardanya Tay-Rong Chang Zijin Ye Gang Xu M. Michael Denner Titus Neupert Benjamin Lienhard Han-Bin Deng Chandan Setty Qimiao Si Guoqing Chang Zurab Guguchia Bin Gao Nana Shumiya Qi Zhang Tyler A. Cochran Daniel Multer Ming Yi Pengcheng Dai M. Zahid Hasan 

作者机构：Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7) Department of Physics Princeton University Princeton New Jersey 08544 USA Department of Physics and Astronomy Rice Center for Quantum Materials Rice University Houston Texas 77005 USA Department of Physics National Cheng Kung University Tainan 70101 Taiwan Wuhan National High Magnetic Field Center & School of Physics Huazhong University of Science and Technology Wuhan 430074 China Department of Physics University of Zurich Winterthurerstrasse 190 8057 Zurich Switzerland Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Laboratory for Quantum Emergence department of physics Southern University of Science and Technology Shenzhen Guangdong 518055 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 639798 Singapore Laboratory for Muon Spin Spectroscopy Paul Scherrer Institute CH-5232 Villigen PSI Switzerland Lawrence Berkeley National Laboratory Berkeley California 94720 USA Princeton Institute for the Science and Technology of Materials Princeton University Princeton New Jersey 08544 USA Quantum Science Center Oak Ridge Tennessee 37830 USA 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2022年第129卷第16期

页      面：166401-166401页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Ministry of Education, MOE National Cheng Kung University, NCKU U.S. Department of Energy, USDOE National Quantum Information Science Research Centers National Center for Theoretical Sciences, NCTS Office of Science, SC Quantum Science Center and Princeton University U.S. NSF-DMR-2100741 National Key Research and Development Program of China, NKRDPC, (2018YFA0307000) National Key Research and Development Program of China, NKRDPC Gordon and Betty Moore Foundation, GBMF, (GBMF4547, GBMF9461) Gordon and Betty Moore Foundation, GBMF Welch Foundation, (C-2024, GBMF9470, C-1411, DE-SC0021421, DE-SC0018197, C-1839) Welch Foundation Basic Energy Sciences program, (DOE/BES DE-FG-02-05ER46200, MOST111-2636-M-006-014) National Natural Science Foundation of China, NSFC, (11874022) National Natural Science Foundation of China, NSFC South University of Science and Technology of China, SUSTC, (Y01202500) South University of Science and Technology of China, SUSTC Horizon 2020 Framework Programme, H2020, (757867) Horizon 2020 Framework Programme, H2020 National Research Foundation Singapore, NRF, (NRF-NRFF13-2021-0010) National Research Foundation Singapore, NRF 

主　　题：Charge density waves Density of states Edge states Electronic structure Topological materials 

摘      要：Kagome materials often host exotic quantum phases, including spin liquids, Chern gap, charge density wave, and superconductivity. Existing scanning microscopy studies of the kagome charge order have been limited to nonkagome surface layers. Here, we tunnel into the kagome lattice of FeGe to uncover features of the charge order. Our spectroscopic imaging identifies a 2×2 charge order in the magnetic kagome lattice, resembling that discovered in kagome superconductors. Spin mapping across steps of unit cell height demonstrates the existence of spin-polarized electrons with an antiferromagnetic stacking order. We further uncover the correlation between antiferromagnetism and charge order anisotropy, highlighting the unusual magnetic coupling of the charge order. Finally, we detect a pronounced edge state within the charge order energy gap, which is robust against the irregular shape fluctuations of the kagome lattice edges. We discuss our results with the theoretically considered topological features of the kagome charge order including unconventional magnetism and bulk-boundary correspondence.