量子涨落对热准凝聚体淬火动力学的影响
量子气体
2016-07-08 v2
摘要
我们研究了相互作用强度淬火后,量子涨落对囚禁准凝聚体中相位、密度及配对关联的影响。为此,我们推导了一种类似于随机 Gross-Pitaevskii 方程 (SGPE) 的描述,但利用 positive-P 表示保留了低能场的完全量子描述。这使我们能够以一体化的方式同时处理量子涨落和热涨落。普通的 SGPE 仅允许热涨落。该方法适用于有限温度量子淬火等情况,但由于相互作用气体的 positive-P 描述固有的时间限制,不适用于平衡态计算。我们观察到了反聚束现象、反向传播原子对的产生以及相位涨落的增加。我们表明,可以通过将 T=0 量子涨落贡献添加到普通 SGPE 描述的热涨落中来估算这种行为。
引用
@article{arxiv.1409.0146,
title = {Quantum fluctuation effects on the quench dynamics of thermal quasicondensates},
author = {Tomasz Świsłocki and Piotr Deuar},
journal= {arXiv preprint arXiv:1409.0146},
year = {2016}
}
备注
17 pages, 18 figures. Major revision, basically a reboot. Equations are now derived rather than heuristically postulated, and the example quench is now physically realistic. The calculations presented are new, but overall results are mostly qualitatively similar. A better understanding of the interplay between quantum and thermal fluctuations has been reached