Soliton core filling in superfluid Fermi gases with spin-imbalance

Abstract

In this paper the properties of dark solitons in superfluid Fermi gases with spin-imbalance are studied by means of a recently developed effective field theory [S. N. Klimin, J. Tempere, G. Lombardi, J. T. Devreese, Eur. Phys. J. B 88, 122 (2015)] suitable to describe the BEC-BCS crossover in ultracold gases in an extended range of temperatures as compared to the usual Ginzburg-Landau treatments. The spatial profiles for the total density and for the density of the excess-spin component, and the changes of their properties across the BEC-BCS crossover are examined in different conditions of temperature and imbalance. The presence of population imbalance is shown to strongly affect the structure of the soliton excitation by filling its core with unpaired atoms. This in turn influences the dynamical properties of the soliton since the additional particles in the core have to be dragged along thus altering the effective mass.

9 pages, 9 figures

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Cited by in corpus (10)

• Many-Body Quantum Dynamics in the Decay of Bent Dark Solitons of Bose-Einstein Condensates
• Suppressed solitonic cascade in spin-imbalanced superfluid Fermi gas
• Rotating quantum turbulence in the unitary Fermi gas
• Dynamics and stabilization of bright soliton stripes in the hyperbolic-dispersion nonlinear Schrödinger equation
• Shapiro steps in strongly-interacting Fermi gases
• Two-dimensional composite solitons in a spin-orbit-coupled Fermi gas in free space
• Dark soliton collisions in superfluid Fermi gases
• Crossover between snake instability and Josephson instability of dark solitons in superfluid Fermi gases
• Dark solitons in the unitary Bose gas
• Vortices in Fermi gases with spin-dependent rotation potentials