Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-06-05
Phys. Rev. A 76, 043610 (2007)
Physics
Condensed Matter
Statistical Mechanics
5 pages, 3 figures
Scientific paper
10.1103/PhysRevA.76.043610
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.
Antezza Mauro
Dalfovo Franco
Pitaevskii Lev P.
Stringari Sandro
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