2005/04/30 by Gabriel Sellier, Thilo Kopp, Johann Kroha +2
Physics and Astronomy · #Bound state #Condensed matter physics #Conductance #Coupling (piping) #Electrical resistivity and conductivity #Josephson effect #Kondo effect #Materials science #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Quantum phase transition #Semiconductor Quantum Structures and Devices #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.72.174502
published as Phys. Rev. B 72, 174502 (2005) · 12 pages, 12 figures
arxiv created 2005/05/03 · openalex publication_date 2005/11/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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\text\ensuremath-\ensuremathπ 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\text\ensuremath-\ensuremathπ transition.