Observation of Thermally Activated Vortex Pairs in a Quasi-2D Bose Gas
arXiv:1211.5649 · doi:10.1103/PhysRevLett.110.175302
Abstract
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.
8 pages, 7 figures, publication version
References in corpus (11)
- Observation of scale invariance and universality in two-dimensional Bose gases
- Observation of a pairing pseudogap in a two-dimensional Fermi gas
- Superfluid behaviour of a two-dimensional Bose gas
- Evolution of Fermion Pairing from Three to Two Dimensions
- Observation of Topologically Stable 2D Skyrmions in an Antiferromagnetic Spinor Bose-Einstein Condensate
- Critical Point of an Interacting Two-Dimensional Atomic Bose Gas
- Vortex proliferation in the Berezinskii-Kosterlitz-Thouless regime on a two-dimensional lattice of Bose-Einstein condensates
- Effect of disorder close to the superfluid transition in a two-dimensional Bose gas
- Semiclassical theory of the quasi two-dimensional trapped Bose gas
- Probing Phase Fluctuations in a 2D Degenerate Bose Gas by Free Expansion
- Disorder-Driven Loss of Phase Coherence in a Quasi-2D Cold Atom System
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