The scissors oscillation of a quasi two-dimensional Bose gas as a local signature of superfluidity

7th International Symposium and Young Scientists School "Modern Problems of Laser Physics"

De Rossi, Camilla^1,2 ; Dubessy, Romain^1,2 ; Merloti, Karina^1,2 ; Goër De Herve, Mathieu De^1,2 ; Badr, Thomas^1,2 ; Perrin, Aurélien^1,2 ; Longchambon, Laurent^1,2 ; Perrin, Hélène^1,2

Université Paris 13, Sorbonne Paris Cité, Laboratoire de Physique des Lasers, Villetaneuse

F-93430, France^1

CNRS, UMR 7538, Villetaneuse

F-93430, France^2

关键词: Bose gas;    Harmonic trap;    Kosterlitz-Thouless;    Local analysis;    Local signatures;    Superfluid phase;    Thermal phase;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/793/1/012023/pdf
DOI  :  10.1088/1742-6596/793/1/012023

来源: IOP

【 摘 要 】

We test the superfluid character of a two-dimensional Bose gas confined in an anisotropic harmonic trap through the frequency of the scissors mode. We show that a local analysis of this frequency allows to evidence the boundary between a superfluid phase at the centre of the cloud and a thermal phase at the edge. The location of this boundary agrees well with the prediction of the Berezinskii-Kosterlitz-Thouless theory within local density approximation.