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

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.

13 pages

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Cited by in corpus (14)

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• Exact quasiparticle properties of a heavy polaron in BCS Fermi superfluids
• Overscreened Kondo effect, (color) superconductivity and Shiba states in Dirac metals and quark matter
• Crossover polarons in a strongly interacting Fermi superfluid
• Magnetic impurity in a one-dimensional few-fermion system
• Emergent QCD Kondo effect in two-flavor color superconducting phase
• Calculations of in-gap states of ferromagnetic spin chains on \textit{s}-wave wide-band superconductors
• Mobile magnetic impurities in a Fermi superfluid: a route to designer molecules
• Dynamics of impurity in the environment of Dirac fermions
• Tunable pairing with local spin-dependent Rydberg molecule potentials in an atomic Fermi superfluid
• The Gor'kov and Melik-Barkhudarov correction to the mean-field critical field transition to Fulde-Ferrell-Larkin-Ovchinnikov states
• Tunable nanomagnetism in moderately cold fermions on optical lattices