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arXiv 1111.4939cond-mat.mes-hallcond-mat.str-elcond-mat.supr-con
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量子点中的Josephson和Andreev输运

Josephson and Andreev transport through quantum dots

A. Martin-Rodero, A. Levy Yeyati

摘要:

本文综述了量子点系统与超导电极和普通电极连接时输运性质的研究现状。综述主要集中在理论成果,但也给出了最相关的实验结果的总结。讨论的很大一部分是致力于单能级安德森型模型推广到包括超导的铅,其中已经包含了大多数有趣的物理现象。特别注意配对和近藤关联之间的竞争,π结行为的出现,Andreev和共振隧穿的相互作用,以及Andreev束缚态的重要作用,这些束缚态表征了大多数这些系统的光谱特性。我们给出了几个不同的分析和数值方法,已开发用于描述这些属性的技术细节。我们进一步讨论了最近的理论努力,致力于将这种分析扩展到更复杂的情况下,如多点,多级或多终端配置,其中新的现象有望出现。这些包括通过约瑟夫森电流控制局域自旋态,以及通过非局域Andreev过程产生纠缠电子对的可能性。

英文摘要:

In this article we review the state of the art on the transport properties of quantum dot systems connected to superconducting and normal electrodes. The review is mainly focused on the theoretical achievements although a summary of the most relevant experimental results is also given. A large part of the discussion is devoted to the single level Anderson type models generalized to include superconductivity in the leads, which already contains most of the interesting physical phenomena. Particular attention is paid to the competition between pairing and Kondo correlations, the emergence of π-junction behavior, the interplay of Andreev and resonant tunneling, and the important role of Andreev bound states which characterized the spectral properties of most of these systems. We give technical details on the several different analytical and numerical methods which have been developed for describing these properties. We further discuss the recent theoretical efforts devoted to extend this analysis to more complex situations like multidot, multilevel or multiterminal configurations in which novel phenomena is expected to emerge. These include control of the localized spin states by a Josephson current and also the possibility of creating entangled electron pairs by means of non-local Andreev processes.

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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