Critical Josephson current through a bistable single-molecule junction

被引：4
作者：
Schulz, Andreas [1 ]
Zazunov, Alex [1 ]
Egger, Reinhold [1 ]
机构：
[1] Univ Dusseldorf, Inst Theoret Phys, D-40225 Dusseldorf, Germany
来源：
PHYSICAL REVIEW B | 2009年 / 79卷 / 18期
关键词：
critical currents; electrochemical electrodes; Josephson effect; molecular electronics; quantum dots; ELECTRON-TRANSPORT; SUPERCURRENT; DYNAMICS;
D O I：
10.1103/PhysRevB.79.184517
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We compute the critical Josephson current through a single-molecule junction. As a model for a molecule with a bistable conformational degree of freedom, we study an interacting single-level quantum dot coupled to a two-level system and weakly connected to two superconducting electrodes. We perform a lowest-order perturbative calculation of the critical current and show that it can significantly change due to the two-level system. In particular, the pi-junction behavior, generally present for strong interactions, can be completely suppressed.
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页数：6
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