论文标题
耦合拓扑平坦和宽带：准颗粒形成和破坏
Coupled topological flat and wide bands: Quasiparticle formation and destruction
论文作者
论文摘要
平面频段扩大相关效应，并且具有广泛的当前兴趣。它们提供了一个平台，可以探索相关设置中的拓扑结构，也可以通过拓扑丰富相关的物理学来探索拓扑。相关的kagome金属的最新实验发现了奇怪金属行为的证据。一个主要的理论挑战是研究局部库仑排斥的效果时，当乐队拓扑阻碍了真正的空间描述。在Kagome晶格的变体中，我们在任何耦合拓扑平坦和宽带的系统中首次确定轨道选择性的Mott Transition。通过构成指数局部和kramers-doublet Wannier功能的构建，这是可能的，这又导致有效的近代晶格描述。我们的发现表明了如何在这种耦合的拓扑平面型带系统中形成准粒子，同样重要的是如何破坏它们。我们的工作为理解Kagome金属及其他地区现有和新兴的奇怪金属特性提供了一个概念框架。
Flat bands amplify correlation effects and are of extensive current interest. They provide a platform to explore both topology in correlated settings and correlation physics enriched by topology. Recent experiments in correlated kagome metals have found evidence for strange-metal behavior. A major theoretical challenge is to study the effect of local Coulomb repulsion when the band topology obstructs a real-space description. In a variant to the kagome lattice, we identify an orbital-selective Mott transition for the first time in any system of coupled topological flat and wide bands. This was made possible by the construction of exponentially localized and Kramers-doublet Wannier functions, which in turn leads to an effective Kondo lattice description. Our findings show how quasiparticles are formed in such coupled topological flat-wide band systems and, equally important, how they are destroyed. Our work provides a conceptual framework for the understanding of the existing and emerging strange-metal properties in kagome metals and beyond.
