Orbital angular momentum in a nonchiral topological superconductor

Shitade, Atsuo*; Nagai, Yuki   

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 -wave pairing potential. Prior to the topological phase transition, we find the crossover from -wave to -wave. For the large spin-orbit interaction, even in the topological phase, does not reach -1/2, which is the universal value in chiral -wave superconductors. Here and are the bulk orbital angular momentum and the total number of electrons at zero temperature, respectively. Finally, we discuss the effects of nonmagnetic impurities.