Bound states of a localized magnetic impurity in a superfluid of paired ultracold fermions

Details Bound states of a localized magnetic impurity in a superfluid of paired ultracold fermions Bound states of a localized magnetic impurity in a superfluid of paired ultracold fermions

2010-10-28

arxiv.org/abs/1010.6085v1

Phys. Rev. A 83, 033619 (2011)

Physics

Condensed Matter

Quantum Gases

13 pages

Scientific paper

10.1103/PhysRevA.83.033619

We consider a localized impurity atom that interacts with a cloud of fermions in the paired state. We develop an effective scattering length description of the interaction between an impurity and a fermionic atom using their vacuum scattering length. Treating the pairing of fermions at the mean-field level, we show that the impurity atom acts like a magnetic impurity in the condensed matter context, and leads to the formation of a pair of Shiba bound states inside the superconducting gap. In addition, the impurity atom can lead to the formation of deeply bound states below the Fermi sea.

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