Physics of the Solid State
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- 2023
- 2022
On the Dirac mass of Hubbard fermions in strongly correlated higher-order topological superconductor
Majorana corner modes have a number of advantages over the conventional Majorana states in terms of performing topologically protected quantum computations. However, the problem of the influence of Coulomb repulsion on higher-order phases, which inevitably arises when trying to implement such systems in practice, has been poorly studied. In this article, we analyze the features of a topological invariant describing the nontrivial phase with the corner modes for a two-dimensional two-orbital model of a hybrid structure in the regime of extremely strong electron correlations. For this purpose, approximate wave functions of the edge states with a linear dispersion law and the associated Dirac masses, which arise when superconducting pairing in the system is taken into account, are obtained. Keywords: topological phases, Dirac fermions, Coulomb interaction, strong correlations, Majorana modes. DOI: 10.61011/PSS.2023.07.56391.31H
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