Andreev Bound States in the Kondo Quantum Dots Coupled to Superconducting Leads

Abstract

We have studied the Kondo quantum dot coupled to two superconducting leads and investigated the subgap Andreev states using the NRG method. Contrary to the recent NCA results [Clerk and Ambegaokar, Phys. Rev. B 61, 9109 (2000); Sellier et al., Phys. Rev. B 72, 174502 (2005)], we observe Andreev states both below and above the Fermi level.

arXiv comment5 pages, 5 figures

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• Nonequilibrium transport via spin-induced sub-gap states in superconductor/quantum dot/normal metal cotunnel junctions
• Study of 0-$\pi$ phase transition in hybrid superconductor-InSb nanowire quantum dot devices
• Numerical sub-gap spectroscopy of double quantum dots coupled to superconductors
• From four- to two-channel Kondo effect in junctions of XY spin chains
• Renormalization effects in interacting quantum dots coupled to superconducting leads
• Josephson current through a quantum dot coupled to a molecular magnet
• Phase and Thermal Driven Transport across T-Shaped Double Quantum Dot Josephson Junction
• Fano resonance in a normal metal/ferromagnet-quantum dot-superconductor device
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• Many-body perturbation theory for the superconducting quantum dot: Fundamental role of the magnetic field
• Suppressed Josephson phase transition in one parallel double-quantum-dot junction
• Influence of superconductivity on the magnetic moment of quantum impurity embedded in BCS superconductor
• Failure of the mean-field description of magnetic fluctuations in the superconducting quantum dot
• Mixed-Valence Transition on a Quantum-Dot Coupled to Superconducting and Spin-Polarized Leads