Interacting topological phases in multiband nanowires

Details Interacting topological phases in multiband nanowires Interacting topological phases in multiband nanowires

2011-04-13

arxiv.org/abs/1104.2358v2

Phys. Rev. B 84, 214528 (2011)

Physics

Condensed Matter

Superconductivity

8 pages, 2 figures; final version to appear in PRB

Scientific paper

10.1103/PhysRevB.84.214528

We show that semiconductor nanowires coupled to an s-wave superconductor provide a playground to study effects of interactions between different topological superconducting phases supporting Majorana zero-energy modes. We consider quasi-one dimensional system where the topological phases emerge from different transverse subbands in the nanowire. In a certain parameter space, we show that there is a multicritical point in the phase diagram where the low-energy theory is equivalent to the one describing two coupled Majorana chains. We study effect of interactions as well as symmetry-breaking perturbations on the topological phase diagram in the vicinity of this multicritical point. Our results shed light on the stability of the topological phase around the multicritical point and have important implications for the experiments on Majorana nanowires.

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