Constructive influence of the induced electron pairing on the Kondo state

Abstract

Superconductivity and magnetism are usually the conflicting (competing) phenomena. We show, however, that in nanoscopic objects the electron pairing may promote the magnetic ordering. 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 enhancing the spin-exchange interactions. The emerging Kondo resonance, which is observable in the Andreev conductance, can be significantly enhanced by 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.

11 pages, 8 figures

References in corpus (16)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• The numerical renormalization group method for quantum impurity systems
• End states and subgap structure in proximity-coupled chains of magnetic adatoms
• Zero-bias anomaly in a nanowire quantum dot coupled to superconductors
• Energy resolution and discretization artefacts in the numerical renormalization group
• Josephson current through a single Anderson impurity coupled to BCS leads
• Shiba states and zero-bias anomalies in the hybrid normal-superconductor Anderson model
• Numerical Renormalization Group Approach to a Quantum Dot Coupled to Normal and Superconducting Leads
• Perturbation theory of a superconducting $0-\pi$ impurity quantum phase transition
• Proximity effect on spin-dependent conductance and thermopower of correlated quantum dots
• Nonequilibrium transport via spin-induced sub-gap states in superconductor/quantum dot/normal metal cotunnel junctions
• Renormalization effects in interacting quantum dots coupled to superconducting leads
• Manual for the Flexible DM-NRG code
• Quantum Monte Carlo study of nonequilibrium transport through a quantum dot coupled to normal and superconducting leads
• Kondo screening of Andreev bound states in an N-QD-S system

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• Temperature Induced Shifts of Yu-Shiba-Rusinov Resonances in Nanowire-Based Hybrid Quantum Dots
• Nonlocal Andreev Reflections as a Source of Spin Exchange and Kondo Screening
• Nonequilibrium Kondo effect by equilibrium numerical renormalization group method: The hybrid Anderson model subject to a finite spin bias
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• Inelastic Kondo-Andreev tunnelings in a vibrating quantum dot
• Rashba induced Kondo screening of a magnetic impurity in two-dimensional superconductor
• Influence of assisted hopping interaction on the linear conductance of quantum dot
• Statistical correlations of currents flowing via proximized quantum dot
• Transient effects in quantum dots contacted via topological superconductor
• Signatures of Kondo-Majorana interplay in ac response
• Nonlocal Andreev transport through a quantum dot in a magnetic field: Interplay between Kondo, Zeeman, and Cooper-pair correlations
• Strongly correlated electrons in superconducting islands with fluctuating Cooper pairs
• Nonequilibrium Kondo-vs-RKKY Scenarios in Nanoclusters
• Transport properties of proximitized double quantum dots
• Interplay between pairing and correlations in spin-polarized bound states
• Giant superconducting proximity effect on spintronic anisotropy
• Properties of multiterminal superconducting nanostructure with double quantum dot
• Transient triplet blockade in Andreev junction