Critical velocity and arrest of a superfluid in a pointlike disordered potential
Critical velocity and arrest of a superfluid in a pointlike disordered potential
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点状无序势中超流体的临界速度和停滞
DOI:
10.1103/physreva.109.013306
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发表时间:
2024
影响因子:
2.9
通讯作者:
Doran R
中科院分区:
文献类型:
--
作者:
Doran R
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.
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DOI:
--
发表时间:
2003
期刊:
影响因子:
--
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通讯作者:
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影响因子:
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Mathematical and Theoretical
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DOI:
10.1088/0953-4075/38/23/008
发表时间:
2005-12-14
影响因子:
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作者:
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通讯作者:
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