Universal impurity-induced bound state in topological superfluids
Abstract
We predict a universal mid-gap bound state in topological superfluids, induced by either non-magnetic or magnetic impurities in the strong scattering limit. This universal state is similar to the lowest-energy Caroli-de Gennes-Martricon bound state in a vortex core, but is bound to localized impurities. We argue that the observation of such a universal bound state can be a clear signature for identifying topological superfluids. We theoretically examine our argument for a spin-orbit coupled ultracold atomic Fermi gas trapped in a two-dimensional harmonic potential, by performing extensive self-consistent calculations within the mean-field Bogoliubov-de Gennes theory. A realistic scenario for observing universal bound state in ultracold K atoms is proposed.
Cite
@article{arxiv.1302.0088,
title = {Universal impurity-induced bound state in topological superfluids},
author = {Hui Hu and Lei Jiang and Han Pu and Yan Chen and Xia-Ji Liu},
journal= {arXiv preprint arXiv:1302.0088},
year = {2013}
}
Comments
5 pages + 4 figures; published in PRL; see the relevant study in 1D: Phys. Rev. A 87, 013622 (2013); see also the accompanying Physics Synopsis: http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.110.020401