title: Majorana modes in time-reversal invariant s-wave topological superconductors.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover, New Hampshire 03755, USA.
authors.forename: Shusa
authors.initials: S
authors.lastname: Deng
authors.forename: Lorenza
authors.initials: L
authors.lastname: Viola
authors.forename: Gerardo
authors.initials: G
authors.lastname: Ortiz