Phys. Rev. Lett. 88, 230404 (2002) [4 pages]Internal State Conversion in Ultracold GasesReceived 21 December 2001; published 23 May 2002 We consider an ultracold gas of (noncondensed) bosons or fermions with two internal states, and we study the effect of a gradient of the transition frequency between these states. When a π/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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.230404
DOI:
10.1103/PhysRevLett.88.230404
PACS:
03.75.Fi, 05.30.-d, 51.10.+y
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