Internal state conversion in ultracold gases

Details Internal state conversion in ultracold gases Internal state conversion in ultracold gases

2001-12-12

arxiv.org/abs/cond-mat/0112228v5

Phys. Rev. Lett. 88, 230404 (2002)

Physics

Condensed Matter

Statistical Mechanics

Accepted version, to appear in PRL

Scientific paper

10.1103/PhysRevLett.88.230404

We consider an ultracold gas of (non-condensed) bosons or fermions with two internal states, and study the effect of a gradient of the transition frequency between these states. When a $\pi/2$ RF pulse is applied to the sample, exchange effects during collisions transfer the atoms into internal states which depend on the direction of their velocity. This results, after a short time, in a spatial separation between the two states. A kinetic equation is solved analytically and numerically; the results agree well with the recent observations of Lewandowski et al.

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