Dynamical Vanishing of the Order Parameter in a Fermionic Condensate
Abstract
We analyze the dynamics of a condensate of ultracold atomic fermions following an abrupt change of the pairing strength. At long times, the system goes to a nonstationary 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.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 2006
- DOI:
- 10.1103/PhysRevLett.96.230404
- arXiv:
- arXiv:cond-mat/0603404
- Bibcode:
- 2006PhRvL..96w0404Y
- Keywords:
-
- 03.75.Kk;
- 74.20.Fg;
- Dynamic properties of condensates;
- collective and hydrodynamic excitations superfluid flow;
- BCS theory and its development;
- Condensed Matter - Superconductivity;
- Condensed Matter - Other
- E-Print:
- 4 pages, 3 figures, journal version