Probing superfluidity in a quasi two-dimensional Bose gas through its local dynamics
Quantum Gases
2016-06-22 v2
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.
Cite
@article{arxiv.1603.00434,
title = {Probing superfluidity in a quasi two-dimensional Bose gas through its local dynamics},
author = {Camilla De Rossi and Romain Dubessy and Karina Merloti and Mathieu De Goër de Herve and Thomas Badr and Aurélien Perrin and Laurent Longchambon and Hélène Perrin},
journal= {arXiv preprint arXiv:1603.00434},
year = {2016}
}