自旋-轨道耦合关联kagome磁体的负平带磁性
Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
摘要：
长期以来，人们一直推测电子平带系统可以成为承载新的涌现现象的肥沃土壤，包括非常规磁性和超导性。虽然已知平带存在于一些系统中，如重费米子材料和扭曲双层石墨烯，但它们在产生涌现行为中的微观作用和潜在机制仍然难以捉摸。在这里，我们使用扫描隧道显微镜来阐明原子分辨的电子状态和它们的磁响应在可果美磁铁Co 3Sn 2S 2。我们观察到一个明显的峰在费米能级，这是确定产生的动力学挫败戈薇平带。当磁场增加到+-8 T时，这种状态表现出反常的磁化极化塞曼位移，主要由与磁场方向相反的轨道矩所控制。这种负磁性可以理解为自旋轨道耦合诱导的量子相位效应与非平凡的平带系统。我们的图像的平带峰，解决相关的负磁性，并提供其连接到Berry曲率场，表明Co 3Sn 2S 2是一个罕见的例子，可果美磁铁的低能物理可以主导的自旋轨道耦合平带。我们的探测带分辨有序现象，如自旋轨道磁性的方法也可以应用在未来的实验中，以阐明其他奇异的现象，包括平带超导和异常量子输运。
英文摘要：
It has long been speculated that electronic flat band systems can be a fertile ground for hosting novel emergent phenomena including unconventional magnetism and superconductivity. Although flat bands are known to exist in a few systems such as heavy fermion materials and twisted bilayer graphene, their microscopic roles and underlying mechanisms in generating emergent behavior remain elusive. Here we use scanning tunneling microscopy to elucidate the atomically resolved electronic states and their magnetic response in the kagome magnet Co3Sn2S2. We observe a pronounced peak at the Fermi level, which is identified to arise from the kinetically frustrated kagome flat band. Increasing magnetic field up to +-8T, this state exhibits an anomalous magnetization-polarized Zeeman shift, dominated by an orbital moment in opposite to the field direction. Such negative magnetism can be understood as spin-orbit coupling induced quantum phase effects tied to non-trivial flat band systems. We image the flat band peak, resolve the associated negative magnetism, and provide its connection to the Berry curvature field, showing that Co3Sn2S2 is a rare example of kagome magnet where the low energy physics can be dominated by the spin-orbit coupled flat band. Our methodology of probing band-resolved ordering phenomena such as spin-orbit magnetism can also be applied in future experiments to elucidate other exotic phenomena including flat band superconductivity and anomalous quantum transport.
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