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Interatomic collisions in a tightly confined Bose gas

2001; American Physical Society; Volume: 64; Issue: 1 Linguagem: Inglês

10.1103/physreva.64.012706

1538-4446

D. S. Petrov, G. V. Shlyapnikov,

Strong Light-Matter Interactions

We discuss binary atomic collisions in a Bose gas tightly confined in one (axial) direction and identify two regimes of scattering. In the quasi-two-dimensional (quasi-2D) regime, where the confinement frequency ${\ensuremath{\omega}}_{0}$ greatly exceeds the gas temperature $T,$ the scattering rates exhibit 2D features of the particle motion. At temperatures $T\ensuremath{\sim}\ensuremath{\Elzxh}{\ensuremath{\omega}}_{0}$ one has a confinement-dominated 3D regime, where the confinement can change the momentum dependence of the scattering amplitudes. We describe the collision-induced energy exchange between the axial and radial degrees of freedom and analyze recent experiments on thermalization and spin-relaxation rates in a tightly (axially) confined gas of Cs atoms.