Josephson current and Andreev states in superconductor-half metal-superconductor heterostructures
Josephson current and Andreev states in superconductor-half metal-superconductor heterostructures
复制标题
超导-半金属-超导异质结构中的约瑟夫森电流和安德烈夫态
DOI：
10.1103/physrevb.77.094520
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发表时间：
2007
影响因子：
3.7
通讯作者：
A. Zaikin
中科院分区：
文献类型：
--
作者：
A. Galaktionov;M. S. Kalenkov;A. Zaikin
我们发展了一种详细的微观理论，描述了半金属超导结中的直流约瑟夫森效应和安德烈夫束缚态。在这种系统中，超导电流是由超导电极和半金属之间的界面上由于自旋翻转散射而产生的三重态配对引起的。对于足够清洁的金属，我们提供了任意传输和自旋翻转散射参数下两个界面的约瑟夫森电流的详细非摄动描述。我们的分析表明，Josephson电流和Andreev束缚态的行为至关重要地取决于自旋翻转散射的强度，显示出丰富多样的特征，可以在未来的实验中进行测试。
We develop a detailed microscopic theory describing dc Josephson effect and Andreev bound states in superconducting junctions with a half metal. In such systems, the supercurrent is caused by triplet pairing states emerging due to spin-flip scattering at the interfaces between superconducting electrodes and the half metal. For sufficiently clean metals, we provide a detailed nonperturbative description of the Josephson current at arbitrary transmissions and spin-flip scattering parameters for both interfaces. Our analysis demonstrates that the behavior of both the Josephson current and Andreev bound states crucially depends on the strength of spin-flip scattering, showing a rich variety of features which can be tested in future experiments.