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arXiv 1902.07558cond-mat.quant-gasquant-ph
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强相互作用费米气体中准凝结和自发涡旋的动力学形成

Dynamic formation of quasicondensate and spontaneous vortices in a strongly interacting Fermi gas

Xiang-Pei Liu, Xing-Can Yao, Youjin Deng, Yu-Xuan Wang, Xiao-Qiong Wang, Xiao-Peng Li, Qijin Chen, Yu-Ao Chen, Jian-Wei Pan

摘要:

本文报道了在强相互作用费米气体中,通过降低俘获势,对超流转变温度$T_c$范围内的猝灭动力学的实验研究。在幺正和BEC区域中,当温度显著高于$T_c$时,非零准凝聚数$N_0$揭示了赝能隙物理.在$T_c$以下,$N_0$的快速增长伴随着数十个涡流的自发产生。我们观察到幂律缩放的涡旋密度与准冷凝物形成时间,与Kibble-Zurek理论。我们的工作为利用猝灭动力学研究涌现的多体物理提供了一个范例,为研究强相互作用费米气体中的量子湍流奠定了基础。

英文摘要:

We report an experimental study of quench dynamics across the superfluid transition temperature $T_c$ in a strongly interacting Fermi gas by ramping down the trapping potential. The nonzero quasi-condensate number $N_0$ at temperature significantly above $T_c$ in the unitary and the BEC regimes reveals the pseudogap physics. Below $T_c$, a rapid growth of $N_0$ is accompanied by spontaneous generation of tens of vortices. We observe a power law scaling of the vortex density versus the quasi-condensate formation time, consistent with the Kibble-Zurek theory. Our work provides an example of studying emerged many-body physics by quench dynamics and paves the way for studying the quantum turbulence in a strongly interacting Fermi gas.

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。

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