Characterization of reconnecting vortices in superfluid helium
Characterization of reconnecting vortices in superfluid helium
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DOI：
10.1073/pnas.0806002105
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发表时间：
2008-09-16
影响因子：
11.1
通讯作者：
Lathrop, Daniel P.
中科院分区：
文献类型：
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作者：
Bewley, Gregory P.;Paoletti, Matthew S.;Lathrop, Daniel P.
当两个漩涡交叉时，每个漩涡都会分裂成两部分，并用自己的一部分交换对方的一部分。这个过程称为涡旋重联，发生在经典流体和超流体以及磁化等离子体和超导体中。我们首次对超流氦中量子化涡旋之间的重新连接进行了实验观察。我们通过对量子化涡核上捕获的微米大小的固体氢粒子进行成像，并从反冲粒子组的运动推断重新连接的发生来做到这一点。我们证明，在刚刚重新连接的涡旋线上分离粒子的距离随着时间的幂律而增长。标度指数的平均值约为1/2，与涡旋的自相似演化一致。
When two vortices cross, each of them breaks into two parts and exchanges part of itself for part of the other. This process, called vortex reconnection, occurs in classical and superfluids, and in magnetized plasmas and superconductors. We present the first experimental observations of reconnection between quantized vortices in superfluid helium. We do so by imaging micrometer-sized solid hydrogen particles trapped on quantized vortex cores and by inferring the occurrence of reconnection from the motions of groups of recoiling particles. We show that the distance separating particles on the just-reconnected vortex lines grows as a power law in time. The average value of the scaling exponent is approximately 1/2, consistent with the self-similar evolution of the vortices.