2015/07/31 by T. Domanski, T. Domański, Ireneusz Weymann +5 · 44 citations
Physics and Astronomy · #Anderson impurity model #Condensed matter physics #Coulomb #Electron #Electron pair #Kondo effect #Magnetism #Observable #Pairing #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Renormalization group #Spin (aerodynamics) #Superconductivity #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1038/srep23336
published in Scientific Reports 6(1), 23336 (Nature Portfolio) · 11 pages, 8 figures
arxiv created 2015/12/16 · arxiv updated 2016/03/22 · openalex publication_date 2016/03/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Superconducting order and magnetic impurities are usually detrimental to each other. We show, however, that in nanoscopic objects the induced electron pairing can have constructive influence on the Kondo effect originating from the effective screening interactions. Such situation is possible at low temperatures in the quantum dots placed between the conducting and superconducting reservoirs, where the proximity induced electron pairing cooperates with the correlations amplifying the spin-exchange potential. The emerging Abrikosov-Suhl resonance, which is observable in the Andreev conductance, can be significantly enhanced by increasing the coupling to superconducting lead. We explain this intriguing tendency within the Anderson impurity model using: the generalized Schrieffer-Wolff canonical transformation, the second order perturbative treatment of the Coulomb repulsion, and the nonperturbative numerical renormalization group calculations. We also provide hints for experimental observability of this phenomenon.