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Kondo effect in an asymmetric Josephson coupling through a quantum dot | | Yoshihide Tanaka
; Akira Oguri
; A. C. Hewson
; | | Date: |
22 Jun 2006 | | Abstract: | Asymmetry in the Josephson couplings between two superconductors through a quantum dot is studied based on a single impurity Anderson model using the numerical renormalization group (NRG). Specifically, we discuss how the difference between the couplings Gamma_L and Gamma_R affects the ground state, which is known to show a quantum phase transition between a nonmagnetic singlet and a magnetic doublet depending on the Coulomb interaction, onsite potential, strength of the hybridization, and the two superconducting gaps Delta_L and Delta_R. Our results show that whether the local moment is fully screened or not depends substantially on the asymmetry in the couplings Gamma_L and Gamma_R. It tends to make the singlet ground state stable, while the amplitude and the phase difference of the superconducting gaps tend to suppress the screening. | | Source: | arXiv, cond-mat/0606581 | | Services: | Forum | Review | PDF | Favorites | |
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