Kondo-enhanced Andreev transport in single self-assembled InAs quantum dots contacted with normal and superconducting leads
Kondo-enhanced Andreev transport in single self-assembled InAs quantum dots contacted with normal and superconducting leads
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DOI：
10.1103/physrevb.81.121308
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发表时间：
2010-03-01
影响因子：
3.7
通讯作者：
Tarucha, S.
中科院分区：
文献类型：
--
作者：
Deacon, R. S.;Tanaka, Y.;Tarucha, S.
我们研究了与一个超导电极和一个普通金属电极接触的自组装 InAs 量子点的输运。低偏压输运主要由安德烈耶夫过程主导，该过程对电子-电子相互作用和近藤效应等局部相关性敏感。我们发现，对于与正常和超导引线的适当隧道耦合，安德烈夫输运通过近藤效应得到增强，并且由于缺乏超导引线的低能激发，近藤温度相对于正常状态降低。
We study transport in self-assembled InAs quantum dots contacted with one superconducting and one normal-metal electrode. Low bias transport is dominated by Andreev processes which are sensitive to local correlations such as electron-electron interaction and the Kondo effect. We identify that, for appropriate tunnel coupling with normal and superconducting leads, Andreev transport is enhanced by the Kondo effect and that the Kondo temperature is reduced relative to the normal state due to lack of low-energy excitations with the superconducting lead.