Cooper pair turbulence in atomic Fermi gasesM. Dzero1, 2, E. A. Yuzbashyan2 and B. L. Altshuler1
1 Department of Physics, Columbia University - New York, NY 10027, USA
2 Center for Materials Theory, Rutgers University - Piscataway, NJ 08854, USA
received 25 November 2008; accepted in final form 18 December 2008; published January 2009
published online 28 January 2009
We investigate under what conditions a uniform quench of a superfluid atomic Fermi gas leads to the emergence of spatial inhomogeneities. We demonstrate that, if the system is larger than the coherence length, the superfluid order parameter becomes spatially nonuniform. Spatial modulations develop through a parametric excitations of pairing modes with opposite momenta. Their growth is eventually suppressed by nonlinear effects resulting in a state characterized by a random superposition of wave packets of the superfluid order parameter. This state can be probed by measuring the molecular momentum distribution following a fast sweep to the BEC side of the Feshbach resonance.
05.30.Fk - Fermion systems and electron gas.
32.80.-t - Photoionization and excitation.
74.25.Gz - Optical properties.
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