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Title: Discovery of charge order and corresponding edge state in kagome magnet FeGe
Authors: Yin, Jia-Xin
Jiang, Yu-Xiao
Teng, Xiaokun
Md. Shafayat Hossain
Mardanya, Sougata
Chang, Tay-Rong
Ye, Zijin
Xu, Gang
Denner, M. Michael
Neupert, Titus
Lienhard, Benjamin
Deng, Han-Bin
Setty, Chandan
Qimiao Si
Chang, Guoqing
Guguchia, Zurab
Gao, Bin
Shumiya, Nana
Zhang, Qi
Cochran, Tyler A.
Multer, Daniel
Yi, Ming
Dai, Pengcheng
M. Zahid Hasan
Keywords: Science::Physics::Electricity and magnetism
Issue Date: 2022
Source: Yin, J., Jiang, Y., Teng, X., Md. Shafayat Hossain, Mardanya, S., Chang, T., Ye, Z., Xu, G., Denner, M. M., Neupert, T., Lienhard, B., Deng, H., Setty, C., Qimiao Si, Chang, G., Guguchia, Z., Gao, B., Shumiya, N., Zhang, Q., ...M. Zahid Hasan (2022). Discovery of charge order and corresponding edge state in kagome magnet FeGe. Physical Review Letters, 129(16), 166401-.
Project: NRF-NRFF13-2021-0010
Journal: Physical Review Letters 
Abstract: 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.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.129.166401
Schools: School of Physical and Mathematical Sciences 
Rights: © 2022 American Physical Society. All rights reserved. This paper was published in Physical Review Letters 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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