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.
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Titolo: | The decay and collisions of dark solitons in superfluid Fermi gases |
Autori: | R. G., Scott; Dalfovo, Franco; Pitaevskiy, Lev; Stringari, Sandro; O., Fialko; R., Liao; J., Brand |
Autori Unitn: | |
Titolo del periodico: | NEW JOURNAL OF PHYSICS |
Anno di pubblicazione: | 2012 |
Codice identificativo Scopus: | 2-s2.0-84857551968 |
Codice identificativo ISI: | WOS:000302307700004 |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1088/1367-2630/14/2/023044 |
Handle: | http://hdl.handle.net/11572/92134 |
Appare nelle tipologie: | 03.1 Articolo su rivista (Journal article) |