Superfluid fraction in an interacting spatially modulated Bose-Einstein condensate
Quantum Gases
2023-07-03 v3
Abstract
At zero temperature, a Galilean-invariant Bose fluid is expected to be fully superfluid. Here we investigate theoretically and experimentally the quenching of the superfluid density of a dilute Bose-Einstein condensate due to the breaking of translational (and thus Galilean) invariance by an external 1D periodic potential. Both Leggett's bound fixed by the knowledge of the total density and the anisotropy of the sound velocity provide a consistent determination of the superfluid fraction. The use of a large-period lattice emphasizes the important role of two-body interactions on superfluidity.
Cite
@article{arxiv.2302.01776,
title = {Superfluid fraction in an interacting spatially modulated Bose-Einstein condensate},
author = {G. Chauveau and C. Maury and F. Rabec and C. Heintze and G. Brochier and S. Nascimbene and J. Dalibard and J. Beugnon and S. M. Roccuzzo and S. Stringari},
journal= {arXiv preprint arXiv:2302.01776},
year = {2023}
}
Comments
typos in the SM corrected