Josephson current through a correlated quantum level: Andreev states and π junction behavior
Josephson current through a correlated quantum level: Andreev states and π junction behavior
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DOI：
10.1103/physrevb.68.035105
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发表时间：
2002-12
影响因子：
3.7
通讯作者：
E. Vecino;A. Martín-Rodero;A. Yeyati
中科院分区：
文献类型：
--
作者：
E. Vecino;A. Martín-Rodero;A. Yeyati
分析了以单能级耦合到超导引线为特征的量子点的约瑟夫森输运和电子特性。使用并比较了不同的近似：平均场近似、库仑相互作用中的二阶微扰理论以及零带宽极限中的精确对角化。该系统表现出丰富的行为作为相关参数的函数。我们详细讨论了观察 π 结行为的条件以及库仑相互作用对安德烈夫态的影响。
The Josephson transport and the electronic properties of a quantum dot characterized by a single level coupled to superconducting leads is analyzed. Different approximations are used and compared: the mean-field approximation, the second-order perturbation theory in the Coulomb interaction, and the exact diagonalization in the zero bandwidth limit. The system exhibits a rich behavior as a function of the relevant parameters. We discuss in detail the conditions for the observation of π junction behavior and the effect of Coulomb interactions on the Andreev states.