Abstract
We study the orbital angular momentum (OAM) in two-dimensional chiral -wave superfluids (SFs) of fermions on a disk at zero temperature, in terms of spectral asymmetry and spectral flow. It is shown that for any integer , in the Bose-Einstein condensation regime. In contrast, in the BCS limit, while the OAM is for the -wave SF, for chiral SFs with , the OAM is remarkably suppressed as , where is the gap amplitude and is the Fermi energy. We demonstrate that the difference between the -wave SF and the other chiral SFs in the BCS regimes originates from the nature of edge modes and related depairing effects.
- Received 8 October 2014
DOI:https://doi.org/10.1103/PhysRevLett.114.195301
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