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Correlation functions in 1D Bose gases : density fluctuations and momentum distribution

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  • UserIsabelle Bouchoule (Institut d'Optique - Palaiseau)
  • ClockFriday 09 March 2012, 14:00-15:00
  • HousePhysics East 217.

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In our atom-chip experiment, very sensitive probes of one-dimensional Bose gases have been developed. First, we use noise analysis on absorption images to measure in-situ atomic density fluctuations. In the weakly interacting regime, we will show how such measurements enable the investigation of the quasi-condensation phenomena. In the quantum quasi-condensate regime, we obtain sub-poissonian fluctuations. Here the atomic anti-bunching, introduced by repulsive interactions, is a precursor of the fermionisation regime. We also show that we enter the strongly interacting regime, where the atomic fluctuations approach that of a Fermi gas. Second, we measure momentum distribution using the focusing technique. Whereas density fluctuations measurements probe higher order correlation functions, the momentum distribution is related to the first order correlation function and gives useful additional insight on the gas properties. We present results obtained in the weakly interacting regime for purely one-dimensional gases. We show that the data are in good agreement with a simple classical field theory and we give the main features observed across the quasi-condensation transition.

This talk is part of the Cold Atoms series.

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