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arXiv 0906.3679cond-mat.mes-hall
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超导双势垒结构中的共振自旋输运

Resonant spin transport through a superconducting double barrier structure

Arijit Kundu, Sumathi Rao, Arijit Saha

摘要:

研究了超导双势垒结构中的共振输运。在每个势垒处,由于邻近效应,入射电子可以反射为电子或空穴(Andreev反射)。类似地,穿过势垒的传输可以通过电子的直接隧穿以及通过空穴传输的交叉Andreev沟道发生。在subgap制度,对于一个对称的双势垒系统(每个障碍的透明度低),我们发现一个新的T=1/4共振(T是双势垒结构上的电子入射的透射概率),由于电子和空穴波函数之间的干扰的两个障碍,在一个正常的双势垒系统,在T=1具有标准的透射共振。作为应用,我们还指出T=1/4的共振值可以通过超导双势垒结构产生纯自旋电流。

英文摘要:

We study resonant transport through a superconducting double barrier structure. At each barrier, due to the proximity effect, an incident electron can either reflect as an electron or a hole (Andreev reflection). Similarly, transport across the barrier can occur via direct tunneling as electrons as well as via the crossed Andreev channel, where a hole is transmitted. In the subgap regime, for a symmetric double barrier system (with low transparency for each barrier), we find a new T=1/4 resonance (T is the transmission probability for electrons incident on the double barrier structure) due to interference between electron and hole wave-functions between the two barriers, in contrast to a normal double barrier system which has the standard transmission resonance at T=1. We also point out as an application that the resonant value of T=1/4 can produce pure spin current through the superconducting double barrier structure.

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