Nonequilibrium transport through a spinful quantum dot with superconducting leads

Abstract

We study the nonlinear cotunneling current through a spinful quantum dot contacted by two superconducting leads. Applying a general nonequilibrium Green function formalism to an effective Kondo model, we study the rich variation in the IV-characteristics with varying asymmetry in the tunnel coupling to source and drain electrodes. The current is found to be carried respectively by multiple Andreev reflections in the symmetric limit, and by spin-induced Yu-Shiba-Russinov bound states in the strongly asymmetric limit. The interplay between these two mechanisms leads to qualitatively different IV-characteristics in the cross-over regime of intermediate symmetry, consistent with recent experimental observations of negative differential conductance and re-positioned conductance peaks in sub-gap cotunneling spectroscopy.

5 pages, 3 figs

References in corpus (10)

• Bipolar supercurrent in graphene
• Quantum supercurrent transistors in carbon nanotubes
• Spectral properties of locally correlated electrons in a BCS superconductor
• Josephson current through a single Anderson impurity coupled to BCS leads
• Even-odd effect in Andreev Transport through a Carbon Nanotube Quantum Dot
• Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots
• Kondo Universal Scaling for a Quantum Dot Coupled to Superconducting Leads
• Superconductivity-enhanced bias spectroscopy in carbon nanotube quantum dots
• Nonequilibrium transport via spin-induced sub-gap states in superconductor/quantum dot/normal metal cotunnel junctions
• Superconducting non-equilibrium transport through a weakly interacting quantum dot

Cited by in corpus (30)

• From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires
• Zero-bias anomaly in a nanowire quantum dot coupled to superconductors
• Single magnetic adsorbates on s-wave superconductors
• Tunneling processes into localized subgap states in superconductors
• Tuning the coupling of an individual magnetic impurity to a superconductor: quantum phase transition and transport
• Shiba states and zero-bias anomalies in the hybrid normal-superconductor Anderson model
• Low-energy theory of transport in Majorana wire junctions
• Transport Measurement of Andreev Bound States in a Kondo-Correlated Quantum Dot
• Temperature dependence of Andreev spectra in a superconducting carbon nanotube quantum dot
• Proximity-induced Shiba states in a molecular junction
• 0-$\pi$ quantum transition in a carbon nanotube Josephson junction: universal phase dependence and orbital degeneracy
• Study of 0-$\pi$ phase transition in hybrid superconductor-InSb nanowire quantum dot devices
• Wigner-Poisson statistics of topological transitions in a Josephson junction
• Interplay Between Yu-Shiba-Rusinov States and Multiple Andreev Reflections
• Interplay between direct and crossed Andreev reflections in hybrid nano-structures
• Subgap features due to quasiparticle tunneling in quantum dots coupled to superconducting leads
• Non-equilibrium transport through a Josephson quantum dot
• A quantum dot in germanium proximitized by a superconductor
• Fermi liquid approach for superconducting Kondo problems
• Josephson current via spin and orbital states of a tunable double quantum dot
• Hard superconducting gap in PbTe nanowires
• Tunnel spectroscopy of Majorana bound states in topological superconductor-quantum dot Josephson junctions
• Solitonic in-gap modes in a superconductor-quantum antiferromagnet interface
• Transient dynamics of a magnetic impurity coupled to superconducting electrodes: exact numerics versus perturbation theory
• Superconducting molybdenum-rhenium electrodes for single-molecule transport studies
• Thermally induced subgap features in the cotunneling spectroscopy of a carbon nanotube
• Phonon-assisted thermoelectric effects in a two-level molecule
• Interplay between pairing and correlations in spin-polarized bound states
• Gate-tunable negative differential conductance in hybrid semiconductor-superconductor devices
• Properties of multiterminal superconducting nanostructure with double quantum dot