Kondo effect and Josephson current through a quantum dot between two superconductors

被引：181

作者：

Choi, MS ^{[1
]}

Lee, M

Kang, K

Belzig, W

机构：

[1] Korea Univ, Dept Phys, Seoul 136701, South Korea

[2] Chonnam Natl Univ, Dept Phys, Kwangju 500757, South Korea

[3] Chonnam Natl Univ, Inst Condensed Matter Theory, Kwangju 500757, South Korea

[4] Univ Basel, Dept Phys & Astron, CH-4056 Basel, Switzerland

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.70.020502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the supercurrent through a quantum dot for the whole range of couplings using the numerical renormalization group method. We find that the Josephson current switches abruptly from a pi- to a 0-phase as the coupling increases. At intermediate couplings the total spin in the ground state depends on the phase difference between the two superconductors. Our numerical results can explain the crossover in the conductance observed experimentally by Buitelaar [ Phys. Rev. Lett. 89, 256801 (2002) ].

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页码：020502 / 1

页数：4

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