Abstract
Recently, the Berezinskii-Kosterlitz-Thouless transition was found to be mediated by half-quantum vortices (HQVs) in two-dimensional (2D) antiferromagnetic Bose gases. We study the thermal activation of HQVs in the experimentally relevant trapped quasi-2D system and find a crossover temperature at which free HQVs proliferate at the center of the trap. Above the crossover temperature, we observe transitions corresponding to the onset of a coherent condensate and a quasicondensate and discuss the absence of a fragmented condensate. A? 2010 The American Physical Society.
Original language | English |
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Pages (from-to) | 1 - 8 |
Number of pages | 8 |
Journal | Physical Review A |
Volume | 81 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2010 |