Topological flat bands in a kagome lattice multiorbital system

Okamoto, Satoshi; Mohanta, Narayan; Dagotto, Elbio R.; Sheng, D. N.

doi:10.1038/s42005-022-00969-1

Topological flat bands in a kagome lattice multiorbital system

Journal Article · Fri Aug 05 00:00:00 EDT 2022 · Communications Physics

DOI:https://doi.org/10.1038/s42005-022-00969-1· OSTI ID:1881137

^[1]; ^[1]; ^[2]; Sheng, D. N. ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
California State University, Northridge (CSUN), CA (United States)

Flat bands and dispersive Dirac bands are known to coexist in the electronic bands in a two-dimensional kagome lattice. Including the relativistic spin-orbit coupling, such systems often exhibit nontrivial band topology, allowing for gapless edge modes between flat bands at several locations in the band structure, and dispersive bands or at the Dirac band crossing. Here, we theoretically demonstrate that a multiorbital system on a kagome lattice is a versatile platform to explore the interplay between nontrivial band topology and electronic interaction. Specifically, here we report that the multiorbital kagome model with the atomic spin–orbit coupling naturally supports topological bands characterized by nonzero Chern numbers $$\mathscr{C}$$, including a flat band with |$$\mathscr{C}$$|=1. When such a flat band is 1/3 filled, the non-local repulsive interactions induce a fractional Chern insulating state. We also discuss the possible realization of our findings in real kagome materials.

View Accepted Manuscript (DOE)

Research Organization:: California State University, Northridge (CSUN), CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; FG02-06ER46305

OSTI ID:: 1881137

Alternate ID(s):: OSTI ID: 2203493

Journal Information:: Communications Physics, Journal Name: Communications Physics Vol. 5; ISSN 2399-3650

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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