Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe
Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe
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Kagome 磁体 FeGe 中电荷序和相应边缘态的发现
DOI：
10.1103/physrevlett.129.166401
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发表时间：
2022
影响因子：
8.6
通讯作者：
Zhang Qi
中科院分区：
文献类型：
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作者：
Yin Jia-Xin;Jiang Yu-Xiao;Teng Xiaokun;Hossain Md. Shafayat;Mardanya Sougata;Chang Tay-Rong;Ye Zijin;Xu Gang;Denner M. Michael;Neupert Titus;Lienhard Benjamin;Deng Han-Bin;Setty Ch;an;Si Qimiao;Chang Guoqing;Guguchia Zurab;Gao Bin;Shumiya Nana;Zhang Qi
Kagome材料经常拥有奇异的量子相，包括自旋液体，Chern间隙，电荷密度波和超导性。现有的扫描显微镜研究的可果美电荷顺序已被限制到nonkagome表面层。在这里，我们隧道进入kagome晶格的FeGe揭示功能的电荷秩序。我们的光谱成像确定了磁戈薇晶格中的2$电荷顺序，类似于在戈薇超导体中发现的。自旋映射跨越步骤的单位晶胞高度证明存在的自旋极化电子与反铁磁堆叠秩序。我们进一步揭示了反铁磁性和电荷序各向异性之间的相关性，突出了电荷序的不寻常的磁耦合。最后，我们检测到一个明显的边缘状态内的电荷序能隙，这是强大的不规则形状波动的戈薇晶格边缘。我们讨论了我们的结果与理论上考虑的拓扑特征的kagome电荷秩序，包括非常规磁性和体边界对应。
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 $2\\ifmmode\\times\\else\\texttimes\\fi{}2$ 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.