Observations of density fluctuations in an elongated Bose gas: ideal gas and quasi-condensate regimes

Details Observations of density fluctuations in an elongated Bose gas: ideal gas and quasi-condensate regimes Observations of density fluctuations in an elongated Bose gas: ideal gas and quasi-condensate regimes

2005-10-14

arxiv.org/abs/cond-mat/0510397v6

Physical Review Letters 96 (2006) 130403

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevLett.96.130403

We report in situ measurements of density fluctuations in a quasi one dimensional Bose gas at thermal equilibrium in an elongated harmonic trap. We observe an excess of fluctuations compared to the shot noise level expected for uncorrelated atoms. At low atomic density, the measured excess is in good agreement with the expected bunching for an ideal Bose gas. At high density, the measured fluctuations are strongly reduced compared to the ideal gas case. We attribute this reduction to repulsive interatomic interactions. The data are compared with a calculation for an interacting Bose gas in the quasi-condensate regime.

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