Interatomic collisions in a tightly confined Bose gas
D. S. Petrov, G. V. Shlyapnikov
Abstract
We discuss pair interatomic collisions in a Bose gas tightly confined in one (axial) direction and identify two regimes of scattering. In the quasi2D regime, where the confinement frequency ω0 greatly exceeds the gas temperature T, the scattering rates exhibit 2D features of the particle motion. At temperatures Tω0 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.
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