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首页> 外文期刊>Journal of Applied Physics >Andreev reflection with spin-flip scattering through a T-shaped double quantum dot
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Andreev reflection with spin-flip scattering through a T-shaped double quantum dot

机译:通过T形双量子点进行自旋翻转散射的Andreev反射

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摘要

The spin-dependent Andreev reflection (AR) tunneling through a ferromagnet double-quantum-dot superconductor (F-DQD-S) is studied using the nonequilibrium Green's function method. The F-DQD-S is a T-shaped hybrid structure where one of the dots is coupled to the F and S electrodes and the other dot is coupled to the first dot only. On each dot the intradot spin-flip process is present. The behavior of the F-DQD-S tunneling conductance is determined by the competition among the interdot coupling, the intradot spin-flip process, and the coupling of the first dot to the electrodes. When the interdot coupling is present, the quantum interference effects between the two dots cause secondary peaks in the tunneling conductance besides the primary one, indicating a structure in the AR spectrum. On the other hand, the spin-flip scattering process suppresses the AR peaks. With the spin-flip scattering strength increasing, the resonance peaks are split.
机译:使用非平衡格林函数方法研究了通过铁磁体双量子点超导体(F-DQD-S)的自旋相关的安德列夫反射(AR)隧穿。 F-DQD-S是T形混合结构,其中一个点耦合到F和S电极,另一个点仅耦合到第一个点。在每个点上都存在点内旋转翻转过程。 F-DQD-S隧穿电导的行为取决于点间耦合,点内自旋翻转过程以及第一个点与电极的耦合之间的竞争。当存在点间耦合时,两个点之间的量子干扰效应会在隧道电导中产生除主峰之外的次峰,这表示AR光谱中的结构。另一方面,自旋翻转散射过程抑制了AR峰。随着自旋翻转散射强度的增加,共振峰分裂。

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