Orbital momentum of chiral superfluids and spectral asymmetry of edge states
G. E. Volovik
Lounasmaa Laboratory, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland
Landau Institute for Theoretical Physics of the RAS, 119334 Moscow, Russia
Abstract
This is comment to preprint arXiv:1409.7459
by
Y. Tada, Wenxing Nie and M. Oshikawa
"Orbital angular momentum and spectral flow in two dimensional chiral
superfluids",
where the effect of spectral flow along the edge states on
the magnitude of the orbital angular momentum is discussed. The general
conclusion of the preprint on the essential reduction of the angular momentum
for the higher values of chirality, |ν|>1, is confirmed. However, we show
that if parity is violated, the reduction of the angular momentum takes place
also for the p-wave superfluids with |ν|=1.