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

Ville Pietila, Tapio Simula, Mikko Mottonen

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    10 Citations (Scopus)

    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 languageEnglish
    Pages (from-to)1 - 8
    Number of pages8
    JournalPhysical Review A
    Volume81
    Issue number3
    DOIs
    Publication statusPublished - 2010

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