Kagome materials often host exotic quantum phases, including spin liquids, Chern gap, charge order, and superconductivity. Existing scanning microscopy studies of the kagome charge order have been limited to non-kagome surface layers. Here we tunnel into the kagome lattice of FeGe to uncover features of the charge order. Our spectroscopic imaging identifes a 2x2 charge order in the magnetic kagome lattice, resembling that discovered in kagome superconductors. Spin-mapping across steps of unit-cell-height demonstrates that this charge order emerges from 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 of the kagome lattice edges. We discuss our results with the theoretically considered topological features of the kagome charge order including orbital magnetism and bulk-boundary correspondence.
@article{arxiv.2203.01888,
title = {Discovery of charge order and corresponding edge state in kagome magnet FeGe},
author = {Jia-Xin Yin and Yu-Xiao Jiang and Xiaokun Teng and Md. Shafayat Hossain and Sougata Mardanya and Tay-Rong Chang and Zijin Ye and Gang Xu and M. Michael Denner and Titus Neupert and Benjamin Lienhard and Han-Bin Deng and Chandan Setty and Qimiao Si and Guoqing Chang and Zurab Guguchia and Bin Gao and Nana Shumiya and Qi Zhang and Tyler A. Cochran and Daniel Multer and Ming Yi and Pengcheng Dai and M. Zahid Hasan},
journal= {arXiv preprint arXiv:2203.01888},
year = {2022}
}