Andreev Transport through Side-Coupled Double Quantum Dots

Abstract

We study the transport through side-coupled double quantum dots, connected to normal and superconducting (SC) leads with a T-shape configuration. We find, using the numerical renormalization group, that the Coulomb interaction suppresses SC interference in the side dot, and enhances the conductance substantially in the Kondo regime. This behavior stands in total contrast to a wide Kondo valley seen in the normal transport. The SC proximity penetrating into the interfacial dot pushes the Kondo clouds, which screens the local moment in the side dot, towards the normal lead to make the singlet bond long. The conductance shows a peak of unitary limit as the cloud expands. Furthermore, two separate Fano structures appear in the gate-voltage dependence of the Andreev transport, where a single reduced plateau appears in the normal transport.

6 pages, 5 figures

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• Fano-type interference in quantum dots coupled between metallic and superconducting leads
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• Spin-polarized Andreev transport influenced by Coulomb repulsion through two quantum dot system
• Interplay between Kondo and Andreev-Josephson effects in a quantum dot coupled to one normal and two superconducting leads
• Spin-dependent thermoelectric phenomena in a quantum dot attached to ferromagnetic and superconducting electrodes
• Correlated electron transport through double quantum dots coupled to normal and superconducting leads
• Spin-polarized conductance in double quantum dots: Interplay of Kondo, Zeeman and interference effects
• Crossover between two different Kondo couplings in side-coupled double quantum dots
• Interplay between direct and crossed Andreev reflections in hybrid nano-structures
• Andreev reflection through Fano resonances in molecular wires
• Local and non-local thermopowers in three-terminal nanostructures
• Decoherence effect on the Fano lineshapes in double quantum dots coupled between normal and superconducting leads
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• Non-hermitian topology in multiterminal superconducting junctions
• Fano-Andreev effect in T-shape double-quantum-dot in the Kondo regime
• Anomalous Fano Resonance in Double Quantum Dot System Coupled to Superconductor
• Replicas of the Fano resonances induced by phonons in a subgap Andreev tunneling
• Interplay of the Kondo effect with the induced pairing in electronic and caloric properties of T-shaped double quantum dots
• Well-defined Fano effect in the Andreev reflection process of a parallel double-quantum-dot structure
• Majorana correlations in quantum impurities coupled to a topological wire
• Magnetoresistance and transistor-like behavior of double quantum dots connected to ferromagnetic and superconductor leads
• Transport properties of proximitized double quantum dots
• Three-body Fermi-liquid corrections for Andreev transport through quantum dots