论文标题
拓扑kagome金属Fege中的电子相关性和电荷密度波
Electron correlations and charge density wave in the topological kagome metal FeGe
论文作者
论文摘要
Kagome金属中的充电顺序具有广泛的当前利益。最近，在磁性二进制kagome金属Fege中发现了电荷密度波。与其前任类似，非磁性$ a $ v $ _3 $ _3 $ sb $ _5 $（$ a $ = k，cs，rb），平面订购订购发生在$ m $点。但是，相反，该系统显然显示了实质性相关性的影响。在这里，我们确定了跨越费米能量（E $ _F $）的拓扑带，并表征了相关诱导的这些频段的重新归一化。然后，我们从有效模型中得出一个有效模型的电荷顺序，该模型在存在磁性顺序的情况下包含拓扑kagome“平坦”带。我们展示了边缘状态以及与电荷顺序相关的过度平面磁矩；两者都是非平凡带拓扑的指纹，并且与最近的实验观察一致。我们的结果将FEGE视为实现和阐明相关拓扑物理学的理想平台。
Charge order in kagome metals is of extensive current interest. Recently, a charge density wave was discovered in the magnetic binary kagome metal FeGe. In analogy to its predecessor, the non-magnetic $A$V$_3$Sb$_5$ ($A$=K, Cs, Rb), the in-plane ordering occurs at the $M$ point. In contrast, however, the system manifestly shows effects of substantial correlations. Here we identify the topological bands crossing the Fermi energy (E$_F$) in FeGe and characterize the correlation-induced renormalization of these bands. We then derive a charge order from an effective model comprising topological kagome `flat' bands in the presence of a magnetic order. We demonstrate edge states as well as excess out-of-plane magnetic moment associated with the charge order; both are fingerprints of non-trivial band topology and consistent with recent experimental observations. Our results point to FeGe as an ideal platform to realize and elucidate correlated topological physics.
