arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1009.5451cond-mat.supr-concond-mat.mes-hallcond-mat.str-elquant-ph
收藏

铁磁绝缘层约瑟夫森结的量子输运理论

Theory of quantum transport in Josephson junctions with a ferromagnetic insulator

Shiro Kawabata, Yasuhiro Asano

摘要:

通过考虑铁磁绝缘体的能带结构,研究了铁磁绝缘体中的约瑟夫森输运。使用递归格林函数方法,我们发现在这样的系统中的π结的形成。此外,随着FI厚度的增加,原子尺度的0-π振荡也随之产生,其振荡周期是普适的,即,只有一个原子层在此基础上,我们证明了在以La $_2$ BaCuO $_5$为势垒的高温超导体的结中可以实现稳定的π态.这种基于FI的约瑟夫森结可能成为未来量子计算机架构中的一个元素。

英文摘要:

We investigate the Josephson transport through ferromagnetic insulators (FIs) by taking into account the band structure of FIs explicitly. Using the recursive Green's function method, we found the formation of a pi-junction in such systems. Moreover the atomic-scale 0-pi oscillation is induced by increasing the thickness of FI and its oscillation period is universal, i.e., just single atomic layer. Based on these results, we show that stable pi-state can be realized in junctions based on high-Tc superconductors with La$_2$BaCuO$_5$ barrier. Such FI-based Josephson junctions may become an element in the architecture of future quantum computers.

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。

↑