超导体中非平衡准粒子效应对畴壁动力学的影响
Nonequilibrium Quasiparticle Effects on Domain Wall Dynamics in Superconductors
- The University of Tokyo（东京大学）
- Nihon University（日本大学）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
本研究通过广义含时金兹堡-朗道框架，揭示II型超导体中畴壁在热偏置下向热端移动，并识别出粘性力与耦合力的作用，为局域温度描述提供微观基础。
中文摘要 AI 辅助
我们研究了连接两个热库的II型超导体中畴壁（DW）的动力学。我们采用广义含时金兹堡-朗道框架，在该框架中，超导序参量和非平衡准粒子分布被视为耦合的动力学变量。在此框架内，热偏置效应通过由库温度设定的准粒子分布边界条件施加。我们通过数值计算和线性响应两种方式证明，畴壁向较热边界移动。从模型隐含的局域动量平衡关系出发，我们识别出一个粘性力以及一个由序参量与非平衡分布函数耦合产生的力。非平衡分布精确地分离为边界驱动部分和由畴壁自身运动产生的部分。前者决定畴壁速度的符号，而后者则重整化序参量的弛豫。这些结果为我们在先前工作中发展的唯象局域温度描述提供了微观基础。
英文摘要
We study the dynamics of a domain wall (DW) in a type-II superconductor connected to two heat reservoirs. We employ a generalized time-dependent Ginzburg--Landau framework in which the superconducting order parameter and the nonequilibrium quasiparticle distribution are treated as coupled dynamical variables. Within this framework, the effect of the thermal bias is imposed through boundary conditions on the quasiparticle distribution, which are set by the reservoir temperatures. We show, both numerically and within linear response, that the DW moves toward the hotter boundary. From the local momentum-balance relation implied by the model, we identify a viscous force and a force arising from the coupling between the order parameter and the nonequilibrium distribution function. The nonequilibrium distribution separates exactly into a boundary-driven part and a part generated by the motion of the DW itself. The former sets the sign of the DW velocity, whereas the latter renormalizes the relaxation of the order parameter. These results provide a microscopic basis for the phenomenological local-temperature description developed in our previous work.
