Dynamical vanishing of the order parameter in a fermionic condensate

Abstract

We analyze the dynamics of a condensate of ultra-cold atomic fermions following an abrupt change of the pairing strength. At long times, the system goes to a non-stationary steady state, which we determine exactly. The superfluid order parameter asymptotes to a constant value. We show that the order parameter vanishes when the pairing strength is decreased below a certain critical value. In this case, the steady state of the system combines properties of normal and superfluid states - the gap and the condensate fraction vanish, while the superfluid density is nonzero.

4 pages, 3 figures, journal version

References in corpus (2)

• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Synchronization in the BCS Pairing Dynamics as a Critical Phenomenon

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• Spectroscopic signatures of nonequilibrium pairing in atomic Fermi gases
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• Probing Fermionic Condensates by Fast-Sweep Projection onto Feshbach Molecules
• Dissipationless BCS Dynamics with Large Branch Imbalance