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

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

2008-10-30

arxiv.org/abs/0810.5519v1

Phys. Rev. B 78, 144515 (2008)

Physics

Condensed Matter

Superconductivity

7 pages, 8 figures

Scientific paper

10.1103/PhysRevB.78.144515

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.

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