Local vs non-local correlation effects in interacting quantum spin Hall insulators

• URL: http://arxiv.org/abs/2110.05364v1
• Date: Mon, 11 Oct 2021 15:50:02 GMT
• Title: Local vs non-local correlation effects in interacting quantum spin Hall insulators
• Authors: Lorenzo Crippa, Adriano Amaricci, Severino Adler, Giorgio Sangiovanni and Massimo Capone
• Abstract summary: The impact of Coulomb interaction on the electronic properties of a quantum spin-Hall insulator is studied using quantum cluster methods. We identify different regimes, according to the value of the bare mass term, characterized by drastically different self-energy contributions.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The impact of Coulomb interaction on the electronic properties of a quantum spin-Hall insulator is studied using quantum cluster methods, disentangling local from non-local effects. We identify different regimes, according to the value of the bare mass term, characterized by drastically different self-energy contributions. For small mass, non-local correlations start to be important and eventually dominate over local ones when getting close enough to the zero-mass semi-metallic line. For intermediate and large mass, local correlation effects outweigh non-local corrections, leading to a first-order topological phase transition, in agreement with previous predictions.

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