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.

5 pages, 5 figures

References in corpus (3)

• Supercurrent reversal in quantum dots
• Quantum supercurrent transistors in carbon nanotubes
• Josephson current through a Kondo molecule

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• 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
• Failure of the mean-field description of magnetic fluctuations in the superconducting quantum dot
• Influence of superconductivity on the magnetic moment of quantum impurity embedded in BCS superconductor