Interaction-induced Metal to Topological Insulator Transition

Abstract

By means of exact diagonalizations, the Bernevig-Hughes-Zhang model at quarter-filling in the limit of strong Hubbard on-site repulsion is investigated. We find that the non-interacting metallic state will be turned into a Chern insulator with saturated magnetization under strong correlations. That is, at such a metal-insulator transition, both the topological and the magnetic properties of the system are changed due to spontaneous breaking of time reversal symmetry in the ground states. According to our findings, this topological phase transition seems to be of first order. Our results illustrate the interesting physics in topological Mott transitions and provide guidance to the search of more interaction-induced topological phases in similar systems.

arXiv comment6 pages, 4 figures

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Cited by in corpus (7)

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• Calculations of Chern number: equivalence of real-space and twisted-boundary-condition formulae
• Transfer learning from Hermitian to non-Hermitian quantum many-body physics
• Heisenberg and Heisenberg-Like Representations via Hilbert Space Bundle Geometry in the Non-Hermitian Regime
• Localization and entanglement characterization of edge states in HgTe quantum wells in a finite strip geometry
• Quantized and nonquantized Hall response in topological Hatsugai-Kohmoto systems