Dynamics of a quantum quench in an ultra-cold atomic BCS superfluid
arXiv:1006.4579 · doi:10.1103/PhysRevA.82.063616
Abstract
We study dynamics of an ultra-cold atomic BCS superfluid driven towards the BCS superfluid-Fermi liquid quantum critical point by a gradual decrease of the pairing interaction. We analyze how the BCS superfluid falls out of equilibrium and show that the non-equilibrium gap and Cooper pair size reflect critical properties of the transition. We observe three stages of evolution: adiabatic where the Cooper pair size is inversely proportional to the equilibrium gap, weakly non-equilibrium where it is inversely proportional to the non-equilibrium gap, and strongly non-equilibrium where it decouples from both equilibrium and non-equilibrium gap. These phenomena should stimulate future experimental characterization of non-equilibrium ultra-cold atomic BCS superfluids.
5 pages, 3 figures, to appear in PRA
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- Appropriate conditions to realize a -wave superfluid state starting from a spin-orbit coupled -wave superfluid Fermi gas