Speaker: Isabelle Bouchoule, Institut d’Optique, France

Title: One-dimensionnal Bose gases in momentum space: equilibrium and out-of-equilibrium behavior

Time and place: Friday January 8, 10:15-11:00, 1520-732

Abstract: On our atom-chip experiment, using the focussing technique, we are able to observe single one-dimensional (1D) Bose gases in momentum-space. We investigated the momentum distribution at equilibrium across the quasi-condensation crossover. Moreover, analyzing statistical noise on the pictures, we measured the two-body correlations in momentum-space. While the momentum distribution does not qualitatively change across the quasi-condensate transition, due to the lack of long-range order in finite temperature 1D Bose gas, the two-body correlations in momentum-space present a clear signature of the quasi-condensation phenomena. Finally, measurements in momentum space are very valuable to study out-of-equilibrium
dynamics. In our experiment, we revisited the breathing mode of a harmonically confined 1D Bose gas and show for the first time the self-reflection mechanism that occurs in the quasi-condensate regime. 

Tea and coffee will be available from 10:00.

Klaus Mølmer