Abstract
When supplemented by a local electron-electron interaction, the Bernevig-Hughes-Zhang model becomes an ideal platform to investigate correlated topological phases. Employing DMFT-based cluster methods, the authors identify two different parameter regions: (i) for intermediate to large orbital polarization, spatially local correlations suffice to describe the interaction-induced transition from trivial to nontrivial topology, confirming the single-site DMFT picture; (ii) in contrast, nonlocal self-energy effects become predominant at low orbital polarization and near the transition from semimetal to Mott phase.
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