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arXiv 2201.04602cond-mat.supr-con
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准粒子注入驱动超导体-正常点-超导体结脱离平衡态的Josephson效应

Josephson effect in superconductor-normal dot-superconductor junctions driven out of equilibrium by quasiparticle injection

Sarath Sankar, Julia S. Meyer, Manuel Houzet

摘要:

我们从理论上研究了超电流通过一个正常的点,是由一个小的准粒子注入电流从正常的引线连接到点引起的大的变化。我们发现,超电流分解成一个subgap贡献,这取决于施加到正常的引线的电压,以及与相反的符号从间隙外的能量,这是不敏感的电压的贡献。随着电压逐渐抑制子带隙贡献,存在临界电压,在该临界电压以上,来自带隙外部的能量的贡献占主导地位,导致电流-相位关系的符号反转,即过渡到所谓的$π$结行为。我们确定的临界电压和分析的鲁棒性的效果相对于温度和非弹性松弛的点。

英文摘要:

We study theoretically the large variations of the supercurrent through a normal dot that are induced by a small quasiparticle injection current from normal leads connected to the dot. We find that the supercurrent decomposes into a subgap contribution, which depends on the voltages applied to the normal leads, as well as a contribution with opposite sign from energies outside the gap, which is insensitive to the voltages. As the voltages gradually suppress the subgap contribution, a critical voltage exists above which the contribution from energies outside the gap dominates, leading to a sign reversal of the current-phase relation, namely a transition to a so-called $π$-junction behavior. We determine the critical voltage and analyze the robustness of the effect with respect to temperature and inelastic relaxation in the dot.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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