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

Yin，Jia Xin1; Jiang，Yu Xiao1; Teng，Xiaokun2; Hossain，Md Shafayat1; Mardanya，Sougata3; Chang，Tay Rong3; Ye，Zijin4; Xu，Gang4; Denner，M. Michael5; Neupert，Titus5; Lienhard，Benjamin6; Deng，Han Bin7; Setty，Chandan2; Si，Qimiao2; Chang，Guoqing8; Guguchia，Zurab9; Gao，Bin2; Shumiya，Nana1; Zhang，Qi1; Cochran，Tyler A.1; Multer，Daniel1; Yi，Ming2; Dai，Pengcheng2; Hasan，M. Zahid1,10,11,12

2022-10-14

10.1103/PhysRevLett.129.166401

PHYSICAL REVIEW LETTERS   影响因子和分区

0031-9007

1079-7114

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.

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PHYSICS

2-s2.0-85140260327

Scopus

1.Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7),Department of Physics,Princeton University,Princeton,08544,United States
2.Department of Physics and Astronomy,Rice Center for Quantum Materials,Rice University,Houston,77005,United States
3.Department of Physics,National Cheng Kung University,Tainan,70101,Taiwan
4.Wuhan National High Magnetic Field Center,School of Physics,Huazhong University of Science and Technology,Wuhan,430074,China
5.Department of Physics,University of Zurich,Zurich,Winterthurerstrasse 190,8057,Switzerland
6.Department of Electrical Engineering and Computer Science,Massachusetts Institute of Technology,Cambridge,02139,United States
7.Laboratory for Quantum Emergence,Department of Physics,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
8.Division of Physics and Applied Physics,School of Physical and Mathematical Sciences,Nanyang Technological University,Singapore,639798,Singapore
9.Laboratory for Muon Spin Spectroscopy,Paul Scherrer Institute,Villigen PSI,CH-5232,Switzerland
10.Lawrence Berkeley National Laboratory,Berkeley,94720,United States
11.Princeton Institute for the Science and Technology of Materials,Princeton University,Princeton,08544,United States
12.Quantum Science Center,Oak Ridge,37830,United States

Yin，Jia Xin,Jiang，Yu Xiao,Teng，Xiaokun,et al. Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe[J]. PHYSICAL REVIEW LETTERS,2022,129(16).

Yin，Jia Xin.,Jiang，Yu Xiao.,Teng，Xiaokun.,Hossain，Md Shafayat.,Mardanya，Sougata.,...&Hasan，M. Zahid.(2022).Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe.PHYSICAL REVIEW LETTERS,129(16).

Yin，Jia Xin,et al."Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe".PHYSICAL REVIEW LETTERS 129.16(2022).