The decay and collisions of dark solitons in superfluid Fermi gases
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: 023044 to: 023044
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).DOI: 10.1088/1367-2630/14/2/023044Citations: 21data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2022-06-26References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here