Josephson effect due to odd-frequency pairs in diffusive half metals
Josephson effect due to odd-frequency pairs in diffusive half metals
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DOI：
10.1103/physrevlett.98.107002
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发表时间：
2007-03-09
影响因子：
8.6
通讯作者：
Golubov, Alexander A.
中科院分区：
文献类型：
--
作者：
Asano, Yasuhiro;Tanaka, Yukio;Golubov, Alexander A.
受最近一项实验的启发[Keizer等人，Nature（伦敦）439，825（2006）]，我们使用递归绿色函数方法研究了超导体/扩散半金属/超导体结中的约瑟夫森效应。结界面处的自旋翻转散射打开了奇频自旋三重态库珀对的约瑟夫森通道。因此，半金属中的局域态密度在费米能处具有大的峰值。因此，奇频对可以通过使用扫描隧道光谱实验检测。
Motivated by a recent experiment [Keizer et al., Nature (London) 439, 825 (2006)], we study the Josephson effect in superconductor/diffusive half metal/superconductor junctions using the recursive Green function method. The spin-flip scattering at the junction interfaces opens the Josephson channel of the odd-frequency spin-triplet Cooper pairs. As a consequence, the local density of states in a half metal has a large peak at the Fermi energy. Therefore the odd-frequency pairs can be detected experimentally by using the scanning tunneling spectroscopy.