Signatures of macroscopic quantum coherence in ultracold dilute Fermi gases

Details Signatures of macroscopic quantum coherence in ultracold dilute Fermi gases Signatures of macroscopic quantum coherence in ultracold dilute Fermi gases

2004-11-15

arxiv.org/abs/cond-mat/0411388v1

Physical Review A 70, 043608 (2004)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevA.70.043608

We propose a double-well configuration for optical trapping of ultracold two-species Fermi-Bose atomic mixtures. Two signatures of macroscopic quantum coherence attributable to a superfluid phase transition for the Fermi gas are analyzed. The first signature is based upon tunneling of Fermi pairs when the power of the deconfining laser beam is significantly reduced. The second relies on the observation of interference fringes in a regime where the fermions are trapped in two sharply separated minima of the potential. Both signatures rely on small decoherence times for the Fermi samples, which should be possible by reaching low temperatures using a Bose gas as a refrigerator, and a bichromatic optical dipole trap for confinement, with optimal heat-capacity matching between the two species.

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