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arXiv 0909.5448cond-mat.supr-con
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磁点耦合约瑟夫森结中的电流-相位关系

Current-phase relation in Josephson junction coupled with a magnetic dot

A. V. Samokhvalov

摘要:

研究了置于铁磁微粒非均匀场中的短约瑟夫森结的电流-相位关系。粒子对结的影响很大,这是由于形成了一对方向相反的Abrikosov涡旋,它们穿透了薄膜超导电极,引起了约瑟夫森相位差的小尺度不均匀性。所引起的相位差的不均匀性示出在非零的固定相位下降$ϕ_0$跨结。对应于结的基态的平衡值$ϕ_0$取决于涡旋-反涡旋对的构型。讨论了调节基态相位差$ϕ_0$的可能性。

英文摘要:

The current-phase relation (CPR) for a short Josephson junction placed in the nonuniform field of a small ferromagnetic particle is studied. The effect of the particle produced on the junction appears to be strong due to the formation of the pair of oppositely directed Abrikosov vortices which pierce the thin film superconducting electrode and cause a small--scale inhomogeneity of Josephson phase difference. The induced phase difference inhomogeneity is shown to result in the nonzero fixed phase drop $ϕ_0$ across the junction. The equilibrium value $ϕ_0$ corresponding to the ground state of the junction depends the configuration of the vortex--antivortex pair. The possibility to tune the ground state phase difference $ϕ_0$ is discussed.

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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