Speaker
Guillaume Chauveau
(Laboratoire Kastler Brossel)
Description
At zero temperature, a Galilean-invariant Bose fluid is expected to be fully superfluid.
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
[1] 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.
[1] A.J. Leggett, “Can a solid be ”superfluid”?” Phys. Rev. Lett. 25, 1543–1546 (1970)
| Affiliation de l'auteur principal | Laboratoire Kastler Brossel |
|---|
Primary authors
Mr
Carl Heintze
Chloé Maury
Mr
Franco Rabec
Guillaume Chauveau
(Laboratoire Kastler Brossel)
Mr
Jean Dalibard
Mr
Jérôme Beugnon
Mr
Sandro Stringari
Mr
Santo Rocuzzo
Mr
Sylvain Nascimbene
