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

2003/12/31 by Mahn-Soo Choi, Minchul Lee, Kicheon Kang +2 · 4 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Topological Materials and Phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.70.020502

Fig.2 and corresponding text have been changed; Several other small changes

arxiv created 2004/03/08 · openalex publication_date 2004/07/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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 \ensuremathπ\text\ensuremath- 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 et al. [Phys. Rev. Lett. 89, 256801 (2002)].

Citations

• Phase Evolution in a Kondo-Correlated System
• Theory of Superconductivity
• The renormalization group: Critical phenomena and the Kondo problem
• Scaling Theory of the Asymmetric Anderson Model
• Resistance Minimum in Dilute Magnetic Alloys

Cited by

• Josephson Current through a Nanoscale Magnetic Quantum Dot
• Critical Current 0−π Transition in Designed Josephson Quantum Dot Junctions
• Kondo effect in asymmetric Josephson couplings through a quantum dot
• Tuning the Josephson current in carbon nanotubes with the Kondo effect