Universal impurity-induced bound state in topological superfluids

Hui Hu; Lei Jiang; Han Pu; Yan Chen; Xia-Ji Liu

doi:10.1103/physrevlett.110.020401

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arXiv · 1302.0088

Universal impurity-induced bound state in topological superfluids

Hui Hu·Lei Jiang·Han Pu·Yan Chen·Xia-Ji Liu

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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 $^{40}$K atoms is proposed.

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Hui Hu, Lei Jiang, Han Pu, Yan Chen, Xia-Ji Liu. 2013-02-01. Universal impurity-induced bound state in topological superfluids. https://doi.org/10.1103/physrevlett.110.020401

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