Imaging real-space flat band localization in kagome magnet FeSn
Imaging real-space flat band localization in kagome magnet FeSn
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DOI：
10.1038/s43246-022-00328-1
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发表时间：
2022-12
影响因子：
7.8
通讯作者：
Daniel Multer;Jia-Xin Yin;M. S. Hossain;Xian P. Yang;B. Sales;Hu Miao;W. Meier;Yu-Xiao Jiang
中科院分区：
文献类型：
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作者：
Daniel Multer;Jia-Xin Yin;M. S. Hossain;Xian P. Yang;B. Sales;Hu Miao;W. Meier;Yu-Xiao Jiang
Kagome晶格由于其受挫的晶格几何形状而具有平坦带，从而导致电子波函数的破坏性量子干涉。在这里，我们报告了使用扫描隧道显微镜在真实空间中成像的kagome平面带定位。在kagome反铁磁体FeSn中，我们用原子分辨率识别了Fe3Sn kagome晶格层和sn2蜂窝层。在Fe3Sn晶格上，在角分辨光发射光谱确定的平带能量下，隧道光谱检测到Fe kagome晶格网络特有的不寻常状态。我们进一步表明，矢量面内磁场操纵每个kagome单元胞内定位状态的空间各向异性。我们的结果与磁kagome晶格的实空间平带局域化一致。我们进一步讨论了自旋轨道耦合磁kagome晶格模型下平带定位的磁调谐。
Kagome lattices host flat bands due to their frustrated lattice geometry, which leads to destructive quantum interference of electron wave functions. Here, we report imaging of the kagome flat band localization in real-space using scanning tunneling microscopy. We identify both the Fe3Sn kagome lattice layer and the Sn2honeycomb layer with atomic resolution in kagome antiferromagnet FeSn. On the Fe3Sn lattice, at the flat band energy determined by the angle resolved photoemission spectroscopy, tunneling spectroscopy detects an unusual state localized uniquely at the Fe kagome lattice network. We further show that the vectorial in-plane magnetic field manipulates the spatial anisotropy of the localization state within each kagome unit cell. Our results are consistent with the real-space flat band localization in the magnetic kagome lattice. We further discuss the magnetic tuning of flat band localization under the spin–orbit coupled magnetic kagome lattice model.