标题： 强关联凯尔文磁体中巨大且各向异性的多体自旋-轨道可调性 显示英文标题

标题： Giant and anisotropic many-body spin-orbit tunability in a strongly correlated kagome magnet

摘要： 由于kagome晶格（由角共享三角形组成的晶格）的不寻常几何结构，其电子有助于研究受挫、关联和拓扑量子电子态的物理性质。 在强自旋-轨道耦合存在的情况下，kagome晶格的磁性和电子结构进一步纠缠，这可能导致以前未知的自旋-轨道现象。 在这里，我们使用矢量磁场能力和扫描隧道显微镜来阐明kagome铁磁体Fe3Sn2的自旋-轨道特性，并探索相关的奇异关联现象。 我们发现，来自kagome晶格的多体电子态与具有三维各向异性的矢量场强烈耦合，表现出由磁化驱动的巨大向列（二重对称）能量偏移。 探测费米子准粒子干涉揭示了一致的自发向列性——电子关联的明确迹象——而矢量磁化能够改变这种状态，从而控制多体电子对称性。 这些由自旋驱动的巨大电子响应远远超出Zeeman物理范围，并指向一种潜在的关联磁拓扑相的实现。 这种kagome磁体的可调性揭示了外加场、电子激发和向列性之间的强相互作用，为控制自旋-轨道特性以及探索拓扑或量子材料中的新兴现象提供了新方法。 显示英文摘要

摘要： Owing to the unusual geometry of kagome lattices-lattices made of corner-sharing triangles-their electrons are useful for studying the physics of frustrated, correlated and topological quantum electronic states. In the presence of strong spin-orbit coupling, the magnetic and electronic structures of kagome lattices are further entangled, which can lead to hitherto unknown spin-orbit phenomena. Here we use a combination of vector-magnetic-field capability and scanning tunnelling microscopy to elucidate the spin-orbit nature of the kagome ferromagnet Fe3Sn2 and explore the associated exotic correlated phenomena. We discover that a many-body electronic state from the kagome lattice couples strongly to the vector field with three-dimensional anisotropy, exhibiting a magnetization-driven giant nematic (two-fold-symmetric) energy shift. Probing the fermionic quasi-particle interference reveals consistent spontaneous nematicity-a clear indication of electron correlation-and vector magnetization is capable of altering this state, thus controlling the many-body electronic symmetry. These spin-driven giant electronic responses go well beyond Zeeman physics and point to the realization of an underlying correlated magnetic topological phase. The tunability of this kagome magnet reveals a strong interplay between an externally applied field, electronic excitations and nematicity, providing new ways of controlling spin-orbit properties and exploring emergent phenomena in topological or quantum materials.