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arXiv 0811.0559cond-mat.supr-con
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半金属-超导体结中三重态邻近效应的量子极限

Quantum limit of the triplet proximity effect in half-metal - superconductor junctions

B. Béri, J. N. Kupferschmidt, C. W. J. Beenakker, P. W. Brouwer

摘要:

本文将散射矩阵方法应用于超导体-半金属结构中的三重态邻近效应。我们发现,结不混合不同的轨道模式,零偏Andreev电导消失,而零偏约瑟夫森电流是非零的。我们在沿界面具有平移不变性的弹道半金属-超导体(HS)和超导体-半金属-超导体(SHS)结以及通过半金属传输的HS和SHS系统上说明了这一发现区域通过单个导电通道发生。我们对这些物理单模设置的计算-单模点接触和具有单模接触的混沌量子点-说明了散射矩阵方法的主要优势:它允许在量子力学极限下研究系统,这对于准经典格林函数方法是不可访问的,准经典格林函数方法是以前关于三重态邻近效应的主要理论工具。

英文摘要:

We apply the scattering matrix approach to the triplet proximity effect in superconductor-half metal structures. We find that for junctions that do not mix different orbital modes, the zero bias Andreev conductance vanishes, while the zero bias Josephson current is nonzero. We illustrate this finding on a ballistic half-metal--superconductor (HS) and superconductor -- half-metal -- superconductor (SHS) junction with translation invariance along the interfaces, and on HS and SHS systems where transport through the half-metallic region takes place through a single conducting channel. Our calculations for these physically single mode setups -- single mode point contacts and chaotic quantum dots with single mode contacts -- illustrate the main strength of the scattering matrix approach: it allows for studying systems in the quantum mechanical limit, which is inaccessible for quasiclassical Green's function methods, the main theoretical tool in previous works on the triplet proximity effect.

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