arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0909.1898cond-mat.quant-gas
收藏

准二维自旋为1的玻色气体的相变-温度相变

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

Ville Pietilä, Tapio P. Simula, Mikko Möttönen

摘要:

最近,Berezinskiii-Kosterlitz-无磁跃迁被发现是由二维(2D)反铁磁玻色气体中的半量子涡旋(HQVs)介导的[Phys. Rev. Lett. 97,120406(2006)]。我们研究了实验相关的准二维系统中的HQVs的热激活,发现如果允许skyrmions,交叉温度向上移动。以上的缺陷结合温度,我们观察到对应于一个连贯的冷凝物和准冷凝物的发病过渡,并讨论了没有一个破碎的冷凝物。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑