Interatomic collisions in a tightly confined Bose gas

Details Interatomic collisions in a tightly confined Bose gas Interatomic collisions in a tightly confined Bose gas

2000-12-06

arxiv.org/abs/cond-mat/0012091v1

Phys. Rev. A 64, 012706 (2001)

Physics

Condensed Matter

Statistical Mechanics

14 pages, 8 figures, revtex

Scientific paper

10.1103/PhysRevA.64.012706

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 $\omega_0$ greatly exceeds the gas temperature $T$, the scattering rates exhibit 2D features of the particle motion. At temperatures $T\sim\hbar\omega_0$ 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.

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