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arXiv 0911.4427cond-mat.mes-hallcond-mat.supr-con
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非局域电荷不平衡的磁场和接触电阻依赖性

Magnetic field and contact resistance dependence of non-local charge imbalance

A. Kleine, A. Baumgartner, J. Trbovic, D. S. Golubev, A. D. Zaikin, C. Schoenenberger

摘要:

金属纳米结构中的交叉Andreev反射(CAR)是固态电子纠缠器件的基础,通常通过检测多端超导体/正常金属器件中的非局域电压来研究。这项任务是困难的,因为其他subgap过程可能掩盖CAR的影响。这些过程之一是电荷不平衡(CI)的产生和非平衡准粒子在超导体中的扩散。在这里,我们证明了一个特性的依赖性的非本地CI上施加的磁场平行的超导导线,这可以理解的CI的标准描述的泛化到非本地的实验。这些结果可用于区分CAR和CI,并提取超导纳米结构中的CI弛豫时间。此外,我们调查的非本地CI的注入器和检测器接触的电阻的依赖性,并证明了一个定量协议与最近的理论,只使用材料和结的特性提取单独的直接测量。

英文摘要:

Crossed Andreev reflection (CAR) in metallic nanostructures, a possible basis for solid-state electron entangler devices, is usually investigated by detecting non-local voltages in multi-terminal superconductor/normal metal devices. This task is difficult because other subgap processes may mask the effects of CAR. One of these processes is the generation of charge imbalance (CI) and the diffusion of non-equilibrium quasi-particles in the superconductor. Here we demonstrate a characteristic dependence of non-local CI on a magnetic field applied parallel to the superconducting wire, which can be understood by a generalization of the standard description of CI to non-local experiments. These results can be used to distinguish CAR and CI and to extract CI relaxation times in superconducting nanostructures. In addition, we investigate the dependence of non-local CI on the resistance of the injector and detector contacts and demonstrate a quantitative agreement with a recent theory using only material and junction characteristics extracted from separate direct measurements.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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