arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2201.11887cond-mat.quant-gas
收藏

类点无序势中超流体的临界速度和滞止

Critical Velocity and Arrest of a Superfluid in a Point-Like Disordered Potential

R. Doran, A. J. Groszek, T. P. Billam

摘要:

超流通过势垒的流动是超冷玻色气体中一个研究得很好的问题,然而,很少有研究考虑通过无序势的情况。在这里,我们考虑的情况下,一个超流体流过一个通道包含多个点状障碍,随机放置,形成一个无序的潜力。我们首先确定两个点状障碍物的相对位置和这种安排的临界速度之间的关系。然后,我们表明,有两个障碍物的系统的临界速度之间的映射,并与大量的障碍物的系统。通过建立一个初始的超流通过一个点状的无序势,移动速度比临界速度快,我们研究如何通过涡旋的成核和超流的崩溃,一个有趣的连接到量子湍流和粗化的问题,超流被逮捕。我们计算的涡旋衰减率的障碍的宽度增加,并表明,涡旋钉扎成为这些较大的障碍更重要的影响。

英文摘要:

Superfluid flow past a potential barrier is a well studied problem in ultracold Bose gases, however, fewer studies have considered the case of flow through a disordered potential. Here we consider the case of a superfluid flowing through a channel containing multiple point-like barriers, randomly placed to form a disordered potential. We begin by identifying the relationship between the relative position of two point-like barriers and the critical velocity of such an arrangement. We then show that there is a mapping between the critical velocity of a system with two obstacles, and a system with a large number of obstacles. By establishing an initial superflow through a point-like disordered potential, moving faster than the critical velocity, we study how the superflow is arrested through the nucleation of vortices and the breakdown of superfluidity, a problem with interesting connections to quantum turbulence and coarsening. We calculate the vortex decay rate as the width of the barriers is increased, and show that vortex pinning becomes a more important effect for these larger barriers.

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。

↑