Coupled topological flat and wide bands: Quasiparticle formation and destruction

Date
2023
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AAAS
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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 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.

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Hu, Haoyu and Si, Qimiao. "Coupled topological flat and wide bands: Quasiparticle formation and destruction." Science Advances, 9, no. 29 (2023) AAAS: https://doi.org/10.1126/sciadv.adg0028.

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