论文标题
由粗糙边界驱动的超流体涡流晶格的旋转
Spin-up of a superfluid vortex lattice driven by rough boundaries
论文作者
论文摘要
我们以数字研究包含超流体氦气的旋转水桶内的涡旋晶格，关注一个重要特征，这在所有实验中实际上是不可避免的：水桶表面的微观粗糙度。我们使用Gross-Pitaevskii对此进行建模，以进行弱相互交互的Bose气体，该模型适用于超流体氦气时，可捕获我们感兴趣的涡流动力学的关键物理。我们发现涡旋晶格是由U型旋转线的相互作用和重新连接而产生的，并伴随着旋转的旋转，并与旋转的量相同，并伴随着单胎的量，并伴随着同类的量，并依靠量，并与旋转的量相同，并依靠量，并伴随着旋转的量。我们量化了在此过程中表面粗糙度和剩余涡流线所做的效果。
We study numerically the formation of a vortex lattice inside a rotating bucket containing superfluid helium, paying attention to an important feature which is practically unavoidable in all experiments: the microscopic roughness of the bucket's surface. We model this using the Gross-Pitaevskii for a weakly-interacting Bose gas, a model which is idealised when applied to superfluid helium but captures the key physics of the vortex dynamics which we are interested in. We find that the vortex lattice arises from the interaction and reconnections of nucleated U-shaped vortex lines, which merge and align along the axis of rotation. We quantify the effects which the surface roughness and remanent vortex lines play in this process.
