奇妙的扁平带及其产地：CoSn-type化合物
Fantastic flat bands and where to find them: The CoSn-type compounds
摘要：
kagome晶格上的量子干涉产生具有窄带宽的电子带，称为平坦带。包含这种晶格的晶体结构可以承载与非标准成分的强电子关联，但前提是这些能带位于费米能级。在具有CoSn结构类型的六种化合物（FeGe、FeSn、CoSn、NiIn、RhPb和PtTl）中，过渡金属形成kagome晶格。这两个铁变体是强大的反铁磁体，所以我们专注于后四个，并研究它们的热力学和输运性质。我们考虑这些结果，并计算能带结构定位和表征这些材料中的平坦带。我们建议，CoSn和RhPb值得社会的关注，探索平带物理。
英文摘要：
Quantum interference on the kagome lattice generates electronic bands with narrow bandwidth, called flat bands. Crystal structures incorporating this lattice can host strong electron correlations with non-standard ingredients, but only if these bands lie at the Fermi level. In the six compounds with the CoSn structure type (FeGe, FeSn, CoSn, NiIn, RhPb, and PtTl) the transition metals form a kagome lattice. The two iron variants are robust antiferromagnets so we focus on the latter four and investigate their thermodynamic and transport properties. We consider these results and calculated band structures to locate and characterize the flat bands in these materials. We propose that CoSn and RhPb deserve the community's attention for exploring flat band physics.
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