Coupled topological flat and wide bands: Quasiparticle formation and destruction

TL;DR

This paper investigates how quasiparticles form and break down in systems with coupled topological flat and wide bands, using a new effective Kondo lattice model to explain strange-metal behavior in kagome metals.

Contribution

It introduces an orbital-selective Mott transition in coupled topological bands and constructs localized Wannier functions enabling a new theoretical framework.

Findings

Identification of orbital-selective Mott transition in topological bands

Construction of localized Wannier functions for coupled bands

Explanation of strange-metal behavior in kagome metals

Abstract

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.