Adiabatically changing the phase-space density of a trapped Bose gas

Details Adiabatically changing the phase-space density of a trapped Bose gas Adiabatically changing the phase-space density of a trapped Bose gas

1996-11-27

arxiv.org/abs/physics/9611026v1

Phys.Rev.Lett.78:990-993,1997

Physics

Atomic Physics

4 pages, 3 figures, Latex, submitted to PRL

Scientific paper

10.1103/PhysRevLett.78.990

We show that the degeneracy parameter of a trapped Bose gas can be changed adiabatically in a reversible way, both in the Boltzmann regime and in the degenerate Bose regime. We have performed measurements on spin-polarized atomic hydrogen in the Boltzmann regime demonstrating reversible changes of the degeneracy parameter (phase-space density) by more than a factor of two. This result is in perfect agreement with theory. By extending our theoretical analysis to the quantum degenerate regime we predict that, starting close enough to the Bose-Einstein phase transition, one can cross the transition by an adiabatic change of the trap shape.

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