Observation of Thermally Activated Vortex Pairs in a Quasi-2D Bose Gas
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
- Publisher
- AMER PHYSICAL SOC
- Issue Date
- 2013-04
- Language
- English
- Article Type
- Article
- Keywords
LONG-RANGE ORDER; 2-DIMENSIONAL SYSTEMS; EINSTEIN CONDENSATE; ATOMIC GAS; TRANSITION; PHASE
- Citation
PHYSICAL REVIEW LETTERS, v.110, no.17
- ISSN
- 0031-9007
- Appears in Collection
- PH-Journal Papers(저널논문)
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