Dynamics of a quantum quench in an ultra-cold atomic BCS superfluid

Details Dynamics of a quantum quench in an ultra-cold atomic BCS superfluid Dynamics of a quantum quench in an ultra-cold atomic BCS superfluid

2010-06-23

arxiv.org/abs/1006.4579v2

Phys. Rev. A 82, 063616 (2010)

Physics

Condensed Matter

Quantum Gases

5 pages, 3 figures, to appear in PRA

Scientific paper

10.1103/PhysRevA.82.063616

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.

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