Anisotropy-Driven Transition from a Collisionless to a Collisional Regime in the Dipolar Modes of a Trapped Gaseous Mixture

P. CAPUZZI; P. VIGNOLO; M. P. TOSI

Trieste, Italia

Workshop; 13th International Laser Physics Workshop; 2004

ICTP

From the numerical solution of the Vlasov–Landau equations for the one-body phase-space distri- bution functions, we evaluate the dipolar oscillations of a harmonically trapped fermion gas containing thermal bosonic impurities as a function of the anisotropy of the trap. Starting from a situation in which the two com- ponents of the gaseous mixture perform almost independent oscillations inside a spherical trap, we demonstrate that different collision behaviors arise for oscillations in different directions as the trap is deformed into an elon- gated cigarlike shape. An increase in the anisotropy of the confinement thus suffices to drive a transition of dipo- lar modes from a collisionless to a collisional regime.