论文标题
BCS-BEC跨界的涡旋重新连接的通用方面
Universal Aspects of Vortex Reconnections across the BCS-BEC Crossover
论文作者
论文摘要
在超流体中重新连接涡流可以使不同长度尺度及其随后的耗散之间的能量转移。本图假设重新连接的动力学主要是由顺序参数的阶段驱动的，并且在Bose-Einstein凝结物（BEC）的情况下，该语句可以证明是合理的，在Bose-Einstein Condens（BEC）中，涡流具有简单的内部结构。因此，自然要假设重新连接力矩附近的重新连接动力学是普遍的。该期望已在BEC的数值模拟中得到了证实，并在实验中为超氟$ {}^4 $ He确认。在费米超流体的背景下，关于这种关系并不多。在本文中，我们旨在弥合这一差距，并报告了我们的发现，该发现表明，重新连接动态符合整个BCS-BEC交叉中预测的普遍行为。通用缩放还可以生存于自旋损伤系统中，在该系统中，未配合的费米子诱发了碰撞涡流的复杂结构。
Reconnecting vortices in a superfluid allow for the energy transfer between different length scales and its subsequent dissipation. The present picture assumes that the dynamics of a reconnection is driven mostly by the phase of the order parameter, and this statement can be justified in the case of Bose-Einstein Condensates (BECs), where vortices have a simple internal structure. Therefore, it is natural to postulate that the reconnection dynamics in the vicinity of the reconnection moment is universal. This expectation has been confirmed in numerical simulations for BECs and experimentally for the superfluid ${}^4$He. Not much has been said about this relation in the context of Fermi superfluids. In this article we aim at bridging this gap, and we report our findings, which reveal that the reconnection dynamics conforms with the predicted universal behaviour across the entire BCS-BEC crossover. The universal scaling also survives for spin-imbalanced systems, where unpaired fermions induce a complex structure of the colliding vortices.
