Matter-wave bistability in coupled atom-molecule quantum gases
arXiv:0907.4779 · doi:10.1103/PhysRevA.81.013619
Abstract
We study the matter-wave bistability in coupled atom-molecule quantum gases, in which heteronuclear molecules are created via an interspecies Feshbach resonance involving either two-species Bose or two-species Fermi atoms at zero temperature. We show that the resonant two-channel Bose model is equivalent to the nondegenerate parametric down-conversion in quantum optics, while the corresponding Fermi model can be mapped to a quantum optics model that describes a single-mode laser field interacting with an ensemble of inhomogeneously broadened two-level atoms. Using these analogy and the fact that both models are subject to the Kerr nonlinearity due to the two-body s-wave collisions, we show that under proper conditions, the population in the molecular state in both models can be made to change with the Feshbach detuning in a bistable fashion.
6 pages, 5 figures
References in corpus (5)
- Nonequilibrium dynamics and thermodynamics of a degenerate Fermi gas across a Feshbach resonance
- Properties of a coupled two species atom-heteronuclear molecule condensate
- Phase Separation in two-Species Atomic Bose-Einstein Condensate with Interspecies Feshbach Resonance
- Matter-wave squeezing and the generation of SU(1,1) and SU(2) coherent-states via Feshbach resonances
- Directional spatial structure of dissociated elongated molecular condensates