Cooper pair turbulence in atomic Fermi gases

Details Cooper pair turbulence in atomic Fermi gases Cooper pair turbulence in atomic Fermi gases

2008-05-19

arxiv.org/abs/0805.2798v1

EPL 85 (2009) 20004

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1209/0295-5075/85/20004

We investigate the stability of spatially uniform solutions for the collisionless dynamics of a fermionic superfluid. We demonstrate that, if the system size is larger than the superfluid coherence length, the solution characterized by a periodic in time order parameter is unstable with respect to spatial fluctuations. The instability is due to the parametric excitations of pairing modes with opposite momenta. The growth of spatial modulations is suppressed by nonlinear effects resulting in a state characterized by a random superposition of wave packets of the superfluid order parameter. We suggest that this state can be probed by spectroscopic noise measurements.

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