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Orbital Frustration and Emergent Flat Bands
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Paper
Orbital Frustration and Emergent Flat Bands
2021
Overview
We expand the concept of frustration in Mott insulators and quantum spin liquids to metals with flat bands. We show that when inter-orbital hopping \\(t_2\\) dominates over intra-orbital hopping \\(t_1\\), in a multiband system with strong spin-orbit coupling \\(\\), electronic states with a narrow bandwidth \\(W t_2^2/\\) are formed compared to a bandwidth of order \\(t_1\\) for intra-orbital hopping. We demonstrate the evolution of the electronic structure, Berry phase distributions for time-reversal and inversion breaking cases, and their imprint on the optical absorption, in a tight binding model of \\(d\\)-orbital hopping on a honeycomb lattice. Going beyond quantum Hall effect and twisted bilayer graphene, we provide an alternative mechanism and a richer materials platform for achieving flat bands poised at the brink of instabilities toward novel correlated and fractionalized metallic phases.
Publisher
Cornell University Library, arXiv.org
