Anomalous Josephson effect induced by spin-orbit interaction and Zeeman effect in semiconductor nanowires

Journal article (2014)
Department
QN/Quantum Nanoscience (AS) (TU Delft)
Copyright: © 2014 American Physical Society
DOI: https://doi.org/doi:10.1103/PhysRevB.89.195407
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Published Date

08-05-2014

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Source:

Physical Review B, 89 (19), 2014

Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Abstract

We investigate theoretically the Josephson junction of semiconductor nanowire with strong spin-orbit (SO) interaction in the presence of magnetic field. By using a tight-binding model, the energy levels En of Andreev bound states are numerically calculated as a function of phase difference ? between two superconductors in the case of short junctions. The dc Josephson current is evaluated from the Andreev levels. In the absence of SO interaction, a 0-? transition due to the magnetic field is clearly observed. In the presence of SO interaction, the coexistence of SO interaction and Zeeman effect results in En(??)?En(?), where the anomalous Josephson current flows even at ?=0. In addition, the direction dependence of critical current is observed, in accordance with experimental results.

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