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

Camilla de Rossi (1, 2) , Romain Dubessy (1, 2) , Karina Merloti (1, 2) , Mathieu de Goër de Herve (1, 2) , Thomas Badr (1, 2) , Aurélien Perrin (1, 2) , Laurent Longchambon (1, 2) , Hélène Perrin (1, 2)

1 LPL - Laboratoire de Physique des Lasers
2 Condensat de Bose-Einstein

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.

Domaines: Gaz Quantiques [cond-mat.quant-gas]

Camilla de Rossi, Romain Dubessy, Karina Merloti, Mathieu de Goër de Herve, Thomas Badr, et al.. The scissors oscillation of a quasi two-dimensional Bose gas as a local signature of superfluidity. Journal of Physics: Conference Series, 2017, VII International Symposium and Young Scientists School "Modern Problems of Laser Physics" 22–28 August 2016, Novosibirsk, Russian Federation, 793 (1), pp.012023. ⟨10.1088/1742-6596/793/1/012023⟩. ⟨hal-01493077⟩