arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.7139cond-mat.supr-con
收藏

界面对断裂结中的非简谐约瑟夫森电流

Anharmonic Josephson current in junctions with an interface pair breaking

Yu. S. Barash

摘要:

具有大的有效Josephson耦合常数和明显的界面对断裂的平面超导结被示出为具有小的临界电流和强非谐电流-相位关系的弱连接。考虑到界面对的破缺以及任意强度的电流退配对和约瑟夫森耦合诱导的对破缺,描述了Tc附近的超电流。得到了一个新的非简谐超电流的解析表达式,它与数值结果非常吻合。在具有大的有效约瑟夫森耦合常数和明显的界面对断裂的结中,电流诱导的退配对在界面附近显著增强,因此尽管在体中存在小的退配对,但对电流-相位关系具有至关重要的影响。

英文摘要:

Planar superconducting junctions with a large effective Josephson coupling constant and a pronounced interface pair breaking are shown to represent weak links with small critical currents and strongly anharmonic current-phase relations. The supercurrent near Tc is described taking into account the interface pair breaking as well as the current depairing and the Josephson coupling-induced pair breaking of arbitrary strengths. A new analytical expression for the anharmonic supercurrent, which is in excellent agreement with the numerical data presented, is obtained. In junctions with a large effective Josephson coupling constant and a pronounced interface pair breaking, the current-induced depairing is substantially enhanced in the vicinity of the interface thus having a crucial influence on the current-phase relation despite a small depairing in the bulk.

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。

↑