Orbital angular momentum in a nonchiral topological superconductor

摘要

We investigate the bulk orbital angular momentum in a two-dimensional time-reversal broken topological superconductor with the Rashba spin-orbit interaction, the Zeeman interaction, and the s-wave pairing potential. Prior to the topological phase transition, we find the crossover from s wave to p wave. For the large spin-orbit interaction, even in the topological phase, L_z/N does not reach - 1/2, which is the intrinsic value in chiral p-wave superconductors. Here L_z and N are the bulk orbital angular momentum and the total number of electrons at zero temperature, respectively. Finally, we discuss the effects of nonmagnetic impurities.