Hu, HuiJiang, LeiPu, HanChen, YanLiu, Xia-Ji2013-01-282013-01-282013Hu, Hui, Jiang, Lei, Pu, Han, et al.. "Universal Impurity-Induced Bound State in Topological Superfluids." <i>Physical Review Letters,</i> 110, (2013) American Physical Society: 20401. http://dx.doi.org/10.1103/PhysRevLett.110.020401.https://hdl.handle.net/1911/69846We predict a universal midgap bound state in topological superfluids, induced by either nonmagnetic 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 a universal bound state in ultracold 40K atoms is proposed.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1103/PhysRevLett.110.020401