"Sub-poissonian atom-number fluctuations in 1D Bose gases : from the quantum weakly interacting regime to the fermionisation regime"

Karen V. Kheruntsyan, T. Jacqmin, Julien Armijo +2 more

By measuring atom number fluctuations in slices of a single 1D Bose gas, we probe the crossover from weak to strong interactions and identify signatures of sub-regimes dominated by thermal and quantum fluctuations.

Joshua M. Wilson, Neel Malvania, Yicheng Zhang +4 more

T. Jacqmin, Julien Armijo, Tarik Berrada +2 more

We report on local, in situ measurements of atom number fluctuations in slices of a one-dimensional Bose gas on an atom chip setup. By using current modulation techniques to prevent cloud fragmentation, we are able to probe the crossover from weak to strong interactions. For weak interactions, fluctuations go continuously from super- to sub-Poissonian as the density is increased, which is a signature of the transition between the subregimes where the two-body correlation function is dominated, respectively, by thermal and quantum contributions. At stronger interactions, the super-Poissonian region disappears, and the fluctuations go directly from Poissonian to sub-Poissonian, as expected for a "fermionized" gas.

Neel Malvania, Lin Xia, Wei Xu +4 more

Isabelle Bouchoule, Julien Armijo, T. Jacqmin +1 more

In this seminar, we present results obtained on our atom-chip setup. Measuring in situ density fluctuations in very elongated gases we probe the physics of 1D Bose gases with repulsive interactions. We investigate the crossover from weakly to strongly interacting gases. For weakly interacting gases, we probed the transition from 1D physics to 3D physics.

Yuan Le, Joshua M. Wilson, Neel Malvania +5 more