The decay and collisions of dark solitons in superfluid Fermi gases

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 BCS regimes, and the excess energy is converted into sound. We interpret this effect as being due to evolution of Andreev bound states localized within the soliton.

9 pages, 5 figures

References in corpus (9)

• Theory of ultracold Fermi gases
• Oscillations and interactions of dark and dark-bright solitons in Bose-Einstein condensates
• Stationary and non-stationary fluid flow of a Bose-Einstein condensate through a penetrable barrier
• Stabilization of Solitons Generated by a Supersonic Flow of Bose-Einstein Condensate Past an Obstacle
• Phase Sensitive Recombination of Two Bose-Einstein Condensates on an Atom Chip
• Solitons, solitonic vortices, and vortex rings in a confined Bose-Einstein condensate
• Traveling Dark Solitons in Superfluid Fermi Gases
• Dipole Oscillations of a Bose-Einstein Condensate in Presence of Defects and Disorder
• Bragg scattering of Cooper pairs in an ultra-cold Fermi gas

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• Dark Solitons with Majorana Fermions in Spin-Orbit-Coupled Fermi Gases
• Snake instability of dark solitons in fermionic superfluids
• Chladni solitons and the onset of the snaking instability for dark solitons in confined superfluids
• Rapid ramps across the BEC-BCS crossover: a novel route to measuring the superfluid gap
• Dark-Bright Solitons in a Superfluid Bose-Fermi Mixture
• Moving solitons in a one-dimensional fermionic superfluid
• Dark solitons dynamics and snake instability in superfluid Fermi gases trapped by an anisotropic harmonic potential
• Dark-soliton-like excitations in the Yang-Gaudin gas of attractively interacting fermions
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• Core filling and snaking instability of dark solitons in spin-imbalanced superfluid Fermi gases
• Dark soliton collisions in superfluid Fermi gases
• Dynamical generation of solitons in one-dimensional Fermi superfluids with and without spin-orbit coupling
• Protocol to engineer Fulde-Ferrell-Larkin-Ovchinnikov states in a cold Fermi gas
• Nonequilibrium Dynamics of Ultracold Fermi Superfluids
• Finding the stable mechanism of ring solitons in two-dimensional Fermi superfluids
• Swallow-tail dispersions of moving solitons in a two-dimensional fermionic superfluid