Local vs non-local correlation effects in interacting quantum spin Hall insulators
arXiv:2110.05364 · doi:10.1103/PhysRevB.104.235117
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.
11 pages, 9 figures
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- Spontaneous Formation of Exceptional Points at the Onset of Magnetism
- Bath parameterization in multi-band cluster Dynamical Mean-Field Theory
- Band structure picture for topology in strongly correlated systems with the ghost Gutzwiller ansatz