Hysteresis in a superfluid atom circuit

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• 作者：Tieling Song ; D.L. Zhou ; ^{zhoudl72@iphy.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Hysteresis ; BEC ; Dissipation
• 刊名：Annals of Physics
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：372
• 期：Complete
• 页码：553-563
• 全文大小：584 K

文摘

We study a hysteresis phenomenon in a rotating BEC with a weak link in a quasi-one-dimensional torus by proposing a microscopic theoretical model including a dissipation bath. By analyzing the role of dissipation and the decay rates of all the energy levels, we are able to give a microscopic interpretation of hysteresis recently observed in the experiment and confirm that the hysteresis is the result of the presence of metastable state. In particular, we obtain the hysteresis loops in a quench process just as that in the experiment. We also find that the shape and size of the hysteresis loop change drastically with the strength of the link.