发表机构
Waseda University（早稻田大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过散射方法结合Bogoliubov-de Gennes方程，分析了一维SNS结的电与热输运特性，揭示了传输轮廓对其非线性响应的关键影响，为相关研究提供了微观参考。
AI 中文摘要
我们研究了一维超导体-正常金属-超导体（SNS）结中与相位无关的直流电流分量，该结处于两个超导库之间存在化学势差和温差的条件下。采用基于Bogoliubov-de Gennes方程的散射方法，我们纳入了多次Andreev反射，同时保留了正常区域传输的能量依赖性。我们对比了能量无关型、量子点型和量子点接触型三种传输轮廓。在低偏压下，两种电流均呈现与超导能隙及多次Andreev反射相关的非线性特征；它们对温差的响应显著依赖于传输轮廓。在小有限偏压下，能量无关型和量子点型轮廓的电流对温差的依赖较弱，而量子点接触型轮廓则产生显著的非线性响应。在所研究的参数范围内，三种轮廓的热电流均对温差呈现非线性依赖。这些结果凸显了传输轮廓在SNS结非线性电与热输运中的作用，并为介观费米超流体结的相关输运研究提供了微观参考。
英文摘要
We investigate the phase-independent dc components of the electric and heat currents through a one-dimensional superconductor-normal-metal-superconductor (SNS) junction subject to chemical-potential and temperature differences between two superconducting reservoirs. Using a scattering approach based on the Bogoliubov-de Gennes equations, we incorporate multiple Andreev reflections while retaining the energy dependence of transmission through the normal region. We compare energy-independent, quantum-dot-type, and quantum-point-contact transmission profiles. At low bias, both currents exhibit nonlinear features associated with the superconducting gap and multiple Andreev reflections. Their responses to a temperature difference depend remarkably on the transmission profile. At a small finite bias, the electric current depends weakly on the temperature difference for the energy-independent and quantum-dot-type profiles, whereas the quantum-point-contact profile produces a pronounced nonlinear response. The heat current depends nonlinearly on the temperature difference for all three profiles over the parameter range investigated. These results highlight the role of the transmission profile in nonlinear electric and heat transport through SNS junctions and provide a microscopic reference for related transport studies in mesoscopic fermionic superfluid junctions.
Comments17 pages, 7 figures
