Meservey-Tedrow-Fulde effect in a quantum dot embedded between metallic and superconducting electrodes

Abstract

Magnetic field applied to the quantum dot coupled between one metallic and one superconducting electrode can produce a similar effect as has been experimentally observed by Meservey, Tedrow and Fulde [Phys. Rev. Lett. 25, 1270 (1970)] for the planar normal metal -- superconductor junctions. We investigate the tunneling current and show that indeed the square root singularities of differential conductance exhibit the Zeeman splitting near the gap edge features V = +/- Delta/e. Since magnetic field affects also the in-gap states of quantum dot it furthermore imposes a hyperfine structure on the anomalous (subgap) Andreev current which has a crucial importance for a signature of the Kondo resonance.

7 pages, 8 figures

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• Nonequilibrium transport via spin-induced sub-gap states in superconductor/quantum dot/normal metal cotunnel junctions
• Spin-polarized Andreev transport influenced by Coulomb repulsion through two quantum dot system
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• Observation of Andreev bound states at spin-active interfaces
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• Interplay between direct and crossed Andreev reflections in hybrid nano-structures
• Decoherence effect on the Fano lineshapes in double quantum dots coupled between normal and superconducting leads
• Renormalization effects in interacting quantum dots coupled to superconducting leads
• Multi-terminal far-from-equilibrium thermoelectric nano-devices in the Kondo regime
• Kondo screening of Andreev bound states in an N-QD-S system
• Splitting efficiency and interference effects in a Cooper pair splitter based on a triple quantum dot with ferromagnetic contacts
• Replicas of the Fano resonances induced by phonons in a subgap Andreev tunneling
• Nonlocal Andreev transport through a quantum dot in a magnetic field: Interplay between Kondo, Zeeman, and Cooper-pair correlations