Dark solitons in a superfluid Fermi gas

Year: 2007

Authors: Antezza M., Dalfovo F., Pitaevskii L.P., Stringari S.

Autors Affiliation: Dipartimento di Fisica, Università di Trento and CNR-INFM BEC, Via Sommarive 14, I-38050 Povo, Italy;
Kapitza Institute for Physical Problems, ul. Kosygina 2, 119334 Moscow, Russia

Abstract: We investigate the behavior of dark solitons in a superfluid Fermi gas along the BCS-BEC crossover by solving the Bogoliubov-de Gennes equations and looking for real and odd solutions for the order parameter. We show that in the resonance unitary region, where the scattering length is large, the density profile of the soliton has a deep minimum, differently from what happens in the BCS regime. The superfluid gap is found to be significantly quenched by the presence of the soliton due to the occurrence of Andreev fermionic bound states localized near the nodal plane of the order parameter.

Journal/Review: PHYSICAL REVIEW A

Volume: 76 (4)      Pages from: 043610-1  to: 043610-4

KeyWords: Ultracold gases; fermions;
DOI: 10.1103/PhysRevA.76.043610

Citations: 73
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