Effects of Interactions on the Critical Temperature of a Trapped Bose Gas

Details Effects of Interactions on the Critical Temperature of a Trapped Bose Gas Effects of Interactions on the Critical Temperature of a Trapped Bose Gas

2011-04-05

arxiv.org/abs/1104.0890v1

Phys. Rev. Lett. 106, 250403 (2011)

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.106.250403

We perform high-precision measurements of the condensation temperature of a harmonically-trapped atomic Bose gas with widely-tuneable interactions. For weak interactions we observe a negative shift of the critical temperature in excellent agreement with mean-field theory. However for sufficiently strong interactions we clearly observe an additional positive shift, characteristic of beyond-mean-field critical correlations. We also discuss non-equilibrium effects on the apparent critical temperature for both very weak and very strong interactions.

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