Probing superfluidity in a quasi two-dimensional Bose gas through its local dynamics

Camilla de Rossi; Romain Dubessy; Karina Merloti; Mathieu de Goër de Herve; Thomas Badr; Aurélien Perrin; Laurent Longchambon; Hélène Perrin

Journal articles

Probing superfluidity in a quasi two-dimensional Bose gas through its local dynamics

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

1 BEC

LPL - Laboratoire de Physique des Lasers

2 LPL - Laboratoire de Physique des Lasers

Abstract : We report direct evidence of superfluidity in a quasi two-dimensional Bose gas by observing its dynamical response to a collective excitation. Relying on a novel local correlation analysis, we are able to probe inhomogeneous clouds and reveal their local dynamics. We identify in this way the superfluid and thermal phases inside the gas and locate the boundary at which the Berezinskii--Kosterlitz--Thouless crossover occurs. This new analysis also allows to evidence the coupling of the two fluids which induces at finite temperatures damping rates larger than the usual Landau damping.

Document type :

Journal articles

Domain :

Physics [physics] / Condensed Matter [cond-mat] / Quantum Gases [cond-mat.quant-gas]

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https://hal.archives-ouvertes.fr/hal-01280816
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Submitted on : Friday, June 3, 2016 - 2:01:44 PM
Last modification on : Wednesday, April 28, 2021 - 3:27:42 AM

Probing superfluidity in a quasi two-dimensional Bose gas through its local dynamics

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Probing superfluidity in a quasi two-dimensional Bose gas through its local dynamics

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