Physical Review Letters
We present a time-reversal invariant s-wave superconductor supporting Majorana edge modes. The multiband character of the model together with spin-orbit coupling are key to realizing such a topological superconductor. We characterize the topological phase diagram by using a partial Chern number sum, and show that the latter is physically related to the parity of the fermion number of the time-reversal invariant modes. By taking the self-consistency constraint on the s-wave pairing gap into account, we also establish the possibility of a direct topological superconductor-to-topological insulator quantum phase transition.
Deng, Shusa; Viola, Lorenza; and Ortiz, Gerardo, "Majorana Modes in Time-Reversal Invariant s -Wave Topological Superconductors" (2012). Open Dartmouth: Faculty Open Access Articles. 2004.