Phase diagram of a model for topological superconducting wires

PÉREZ DAROCA, D.; ALIGIA, A. A.

Physical Review B

APS

Año: 2021 vol. 104

2469-9950

We calculate the phase diagram of a model for topological superconducting wires with local s-wave pairing,spin-orbit coupling λ , and magnetic field B with arbitrary orientations. This model is a generalized lattice versionof the one proposed by Lutchyn et al. [Phys. Rev. Lett. 105, 077001 (2010)] and Oreg et al. [Phys. Rev. Lett. 105, The model has a topological gapped phase with Majorana177002 (2010)], who considered λ perpendicular to B.zero modes localized at the ends of the wires. We determine analytically the boundary of this phase. When thedirections of the spin-orbit coupling and magnetic field are not perpendicular, in addition to the topological phaseand the gapped nontopological phase, a gapless superconducting phase appears.