Phase diagram of a model for topological superconducting wires
D. Pérez Daroca, A. A. Aligia
DOI 10.1103/PhysRevB.104.115125 · Physical Review B
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Abstract
We calculate the phase diagram of a model for topological superconducting wires with local s-wave pairing, spin-orbit coupling λ⃗, and magnetic field B⃗ with arbitrary orientations. This model is a generalized lattice version of the one proposed by Lutchyn et al. [Phys. Rev. Lett. 105, 077001 (2010)] and Oreg et al. [Phys. Rev. Lett. 105, 177002 (2010)], who considered λ⃗ perpendicular to B⃗. The model has a topological gapped phase with Majorana zero modes localized at the ends of the wires. We determine analytically the boundary of this phase. When the directions of the spin-orbit coupling and magnetic field are not perpendicular, in addition to the topological phase and the gapped nontopological phase, a gapless superconducting phase appears.
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