Abstract：
A kagome lattice hosts a plethora of quantum states arising from the interplay between nontrivial topology and electron correlations. The recently discovered kagome magnet RMn6Sn6 (R represents a rare-earth element) is believed to showcase a kagome band closely resembling textbook characteristics. Here, we report the characterization of local electronic states and their magnetization response in YMn6Sn6 via scanning tunneling microscopy measurements under vector magnetic fields. Our spectroscopic maps reveal a spontaneously trimerized kagome electronic order in YMn6Sn6, where the 6-fold rotational symmetry is disrupted while translational symmetry is maintained. Further application of an external magnetic field demonstrates a strong coupling of the YMn6Sn6 kagome band to the field, which exhibits an energy shift discrepancy under different field directions, implying the existence of magnetization-response anisotropy and anomalous g factors. Our findings establish YMn6Sn6 as an ideal platform for investigating kagome-derived orbital magnetic moment and correlated magnetic topological states.
摘要：
kagome晶格拥有大量的量子态，这些量子态是由非平凡拓扑和电子相关性之间的相互作用引起的。最近发现的kagome磁体RMn6Sn6（R代表稀土元素）被认为展示了与教科书特征非常相似的kagome带。这里,我们通过在矢量磁场下的扫描隧道显微镜测量报告了YMn6Sn6中局部电子态及其磁化响应的表征。我们的光谱图揭示了YMn6Sn6中自发三聚的kagome电子顺序，其中6重旋转对称性被破坏，而平移对称性得以保持。外部磁场的进一步应用表明YMn6Sn6kagome带与磁场的强耦合，在不同的场方向上表现出能量偏移差异，暗示存在磁化响应各向异性和异常g因子。我们的发现将YMn6Sn6确立为研究kagome衍生的轨道磁矩和相关磁拓扑状态的理想平台。
