The decay and collisions of dark solitons in superfluid Fermi gases

Year: 2012

Authors: Scott R.G., Dalfovo F., Pitaevskii L.P., Stringari S., Fialko O., Liao L., Brand J.

Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, Via Sommarive 14, I-38123 Povo, Italy;
Kapitza Institute for Physical Problems, ul. Kosygina 2, 119334 Moscow, Russia;
New Zealand Institute for Advanced Study and Centre for Theoretical Chemistry and Physics, Massey University, Private Bag 102904 NSMC, Auckland 0745, New Zealand

Abstract: We study soliton collisions and the decay of solitons into sound in superfluid Fermi gases across the Bose-Einstein condensate to Bardeen-Cooper-Schrieffer (BEC-BCS) crossover by performing numerical simulations of the time-dependent Bogoliubov-de Gennes equations. This decay process occurs when the solitons are accelerated to the bulk pair-breaking speed by an external potential. A similar decay process may occur when solitons are accelerated by an inelastic collision with another soliton. We find that soliton collisions become increasingly inelastic as we move from the BEC to the BCS regime, and the excess energy is converted into sound. We interpret this effect as being due to the evolution of Andreev bound states localized within the soliton.

Journal/Review: NEW JOURNAL OF PHYSICS

Volume: 14      Pages from: 23044-1  to: 23044-14

More Information: This work has been supported by ERC through the QGBE grant. OF and JB were supported by the Marsden Fund of New Zealand (contract no. MAU0910).
KeyWords: Bose-einstein Condensate; Intermediate State; Superconductors; Waves
DOI: 10.1088/1367-2630/14/2/023044

Citations: 23
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