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

Author(s)
Vernier, Eric; Pekker, David; Zwierlein, Martin Wolfram; Demier, Eugene
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Abstract
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.
Date issued
2011-03
URI
http://hdl.handle.net/1721.1/65821
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics; MIT-Harvard Center for Ultracold Atoms
Journal
Physical review A
Publisher
American Physical Society
Citation
Vernier, Eric et al. “Bound States of a Localized Magnetic Impurity in a Superfluid of Paired Ultracold Fermions.” Physical Review A 83.3 (2011) : n. pag. ©2011 American Physical Society
Version: Final published version
ISSN
1050-2947
1094-1622

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