Observation of Thermally Activated Vortex Pairs in a Quasi-2D Bose Gas

被引：42

作者：

Choi, Jae-yoon ^{[1
]}

Seo, Sang Won

Shin, Yong-il

机构：

[1] Seoul Natl Univ, Ctr Subwavelength Opt, Seoul 151747, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 17期

关键词：

LONG-RANGE ORDER; TRANSITION;

D O I：

10.1103/PhysRevLett.110.175302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measure the in-plane distribution of thermally activated vortices in a trapped quasi-2D Bose gas, where we enhance the visibility of density-depleted vortex cores by radially compressing the sample before releasing the trap. The pairing of vortices is revealed by the two-vortex spatial correlation function obtained from the vortex distribution. The vortex density decreases gradually as temperature is lowered, and below a certain temperature, a vortex-free region emerges in the center of the sample. This shows the crossover from a Berezinskii-Kosterlitz-Thouless phase containing vortex-pair excitations to a vortex-free Bose-Einstein condensate in a finite-size 2D system. DOI: 10.1103/PhysRevLett.110.175302

引用

页数：5

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