Cold Fermi atomic gases in a pumped optical resonator

Details Cold Fermi atomic gases in a pumped optical resonator Cold Fermi atomic gases in a pumped optical resonator

2008-04-16

arxiv.org/abs/0804.2577v2

Phys. Rev. A 78, 023815 (2008)

Physics

Quantum Physics

Two column, three figures. Replaced with final version

Scientific paper

10.1103/PhysRevA.78.023815

We study systems of fully polarized ultracold atomic gases obeying Fermi statistics. The atomic transition interacts dispersively with a mode of a standing-wave cavity, which is coherently pumped by a laser. In this setup, the intensity of the intracavity field is determined by the refractive index of the atomic medium, and thus by the atomic density distribution. Vice versa, the density distribution of the atom is determined by the cavity field potential, whose depth is proportional to the intracavity field amplitude. In this work we show that this nonlinearity leads to an instability in the intracavity intensity that differs substantially from dispersive optical bistability, as this effect is already present in the regime, where the atomic dipole is proportional to the cavity field. Such instability is driven by the matter waves fluctuations and exhibits a peculiar dependence on the fluctuations in the atomic density distribution.

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