Kondo effect and Josephson current through a quantum dot between two superconductors
Kondo effect and Josephson current through a quantum dot between two superconductors
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DOI：
10.1103/physrevb.70.020502
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发表时间：
2004-07-01
影响因子：
3.7
通讯作者：
Belzig, W
中科院分区：
文献类型：
--
作者：
Choi, MS;Lee, M;Belzig, W
我们用数值重整化群方法研究了整个耦合范围内量子点的超电流。我们发现，随着耦合的增加，约瑟夫森电流突然从-相位切换到0相位。在中间耦合中，基态的总自旋取决于两个超导体之间的相位差。我们的数值结果可以解释Buitelaar [Phys]在实验中观察到的电导交叉现象。[j].科学通报，2002(1)。
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) ].