pi junction behavior and Andreev bound states in Kondo quantum dots with superconducting leads

Article

关键词: NUMERICAL-RENORMALIZATION-GROUP;    IMPURITY JOSEPHSON-JUNCTION;    FERMI LIQUID BEHAVIOR;    ANDERSON MODEL;    MAGNETIC-IMPURITIES;    COULOMB REPULSION;    SLAVE;    VALENCE;    BARRIER;    SYSTEMS;   

DOI  :  10.1103/PhysRevB.72.174502

来源: SCIE

【 摘 要 】

We investigate the temperature- and coupling-dependent transport through Kondo dot contacts with symmetric superconducting s-wave leads. For finite temperature T we use a superconducting extension of a self-consistent auxiliary boson scheme (SNCA), while at T=0 a perturbative renormalization group treatment is applied. The finite-temperature phase diagram for the 0-pi transition of the Josephson current in the junction is established and related to the phase-dependent position of the subgap Kondo resonance with respect to the Fermi energy. The conductance of the contact is evaluated in the zero-bias limit. It approaches zero in the low-temperature regime, however, at finite T its characteristics are changed through the coupling- and temperature-dependent 0-pi transition.

【 授权许可】

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