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

被引：14

作者：

De Rossi, Camilla ^{[1
,2
]}

Dubessy, Romain ^{[1
,2
]}

Merloti, Karina ^{[1
,2
]}

de Herve, Mathieu de Goer ^{[1
,2
]}

Badr, Thomas ^{[1
,2
]}

Perrin, Aurelien ^{[1
,2
]}

Longchambon, Laurent ^{[1
,2
]}

Perrin, Helene ^{[1
,2
]}

机构：

[1] Univ Paris 13, Sorbonne Paris Cite, Lab Phys Lasers, F-93430 Villetaneuse, France

[2] CNRS, UMR 7538, F-93430 Villetaneuse, France

来源：

NEW JOURNAL OF PHYSICS | 2016年 / 18卷

关键词：

quantum gases; superfluidity; two-dimensional; scissors; hydrodynamics; EINSTEIN CONDENSED GAS; SCISSORS MODE; 2-DIMENSIONAL SYSTEMS; EXCITATIONS; COLLOQUIUM;

D O I：

10.1088/1367-2630/18/6/062001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report direct evidence of superfluidity in a quasi two-dimensional Bose gas by observing its dynamical response to a collective excitation, the scissors mode. Relying on a novel local average 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.

引用

页数：7

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