Kondo physics in double quantum dot based Cooper pair splitters

Abstract

The Andreev transport properties of double quantum dot based Cooper pair splitters with one superconducting and two normal leads are studied theoretically in the Kondo regime. The influence of the superconducting pairing correlations on the local density of states, Andreev transmission coefficient and Cooper pair splitting efficiency is thoroughly analyzed. It is shown that finite superconducting pairing potential quickly suppresses the SU(2) Kondo effect, which can however reemerge for relatively large values of coupling to superconductor. In the SU(4) Kondo regime, a crossover from the SU(4) to the SU(2) Kondo state is found as the coupling to superconductor is enhanced. The analysis is performed by means of the density-matrix numerical renormalization group method.

References in corpus (25)

• The numerical renormalization group method for quantum impurity systems
• Zero-bias anomaly in a nanowire quantum dot coupled to superconductors
• Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures
• Near-unity Cooper pair splitting efficiency
• Spectral properties of locally correlated electrons in a BCS superconductor
• Protection of excited spin states by a superconducting energy gap
• Cooper Pair Splitting by means of Graphene Quantum Dots
• Shiba states and zero-bias anomalies in the hybrid normal-superconductor Anderson model
• Superconducting proximity effect in interacting double-dot systems
• Numerical Renormalization Group Approach to a Quantum Dot Coupled to Normal and Superconducting Leads
• Current and noise correlations in a double dot Cooper pair beam splitter
• Transport Measurement of Andreev Bound States in a Kondo-Correlated Quantum Dot
• Non-local Andreev transport through an interacting quantum dot
• Unconventional Superconductivity in Double Quantum Dots
• Local electrical tuning of the nonlocal signals in a Cooper pair splitter
• Proximity effect on spin-dependent conductance and thermopower of correlated quantum dots
• Spin-polarized Andreev transport influenced by Coulomb repulsion through two quantum dot system
• Probing the exchange field of a quantum-dot spin valve by a superconducting lead
• Superconducting proximity effect and zero-bias anomaly in transport through quantum dots weakly attached to ferromagnetic leads
• Optimal broadening of finite energy spectra in the numerical renormalization group: application to dissipative dynamics in two-level systems
• Decoherence effect on the Fano lineshapes in double quantum dots coupled between normal and superconducting leads
• Double quantum dot Cooper-pair splitter at finite couplings
• Renormalization effects in interacting quantum dots coupled to superconducting leads
• Manual for the Flexible DM-NRG code
• Interplay between electron pairing and Dicke effect in triple quantum dots structures