Finite-temperature phase transitions in quasi-two-dimensional spin-1 Bose gases

Details Finite-temperature phase transitions in quasi-two-dimensional spin-1 Bose gases Finite-temperature phase transitions in quasi-two-dimensional spin-1 Bose gases

2009-09-10

arxiv.org/abs/0909.1898v3

Phys. Rev. A 81, 033616 (2010).

Physics

Condensed Matter

Quantum Gases

4 pages, 3 figures; v2 - additional details; v3 - published version, minor changes.

Scientific paper

10.1103/PhysRevA.81.033616

Recently, the Berezinskii-Kosterlitz-Thouless transition was found to be mediated by half-quantum vortices (HQVs) in two-dimensional (2D) antiferromagnetic Bose gases [Phys. Rev. Lett. 97, 120406 (2006)]. We study the thermal activation of HQVs in the experimentally relevant trapped quasi-2D systems and find that the crossover temperature is shifted upwards if skyrmions are allowed. Above the defect binding temperatures we observe transitions corresponding to the onset of a coherent condensate and a quasi-condensate and discuss the absence of a fragmented condensate.

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