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Controlled π-junctions in a T-shaped double quantum dot system

  • Mesoscopic and Nanoscale Systems
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Abstract

The π-junction transition of a T-shaped double quantum dot system is investigated theoretically by using the nonequilibrium Green’s function method. It is found that the π-junction transition can occur with increasing the spin-flip strength. Furthermore, the π-junction in the system can be controlled by tuning the system parameters, such as the two quantum dot energy levels and the interdot coupling. These controlled π-junction transitions are interpreted in the picture of current-carrying density of states. When the main contributions to supercurrent is changed between the positive discrete spectrum and the negative continuous spectrum, the π-junction transitions can happen.

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Authors and Affiliations

  1. Department of Physics, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P.R. China

    H. Pan

  2. Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO, 80523, USA

    Y.-H. Zhao

Authors
  1. H. Pan
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  2. Y.-H. Zhao
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Correspondence to H. Pan.

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Pan, H., Zhao, YH. Controlled π-junctions in a T-shaped double quantum dot system. Eur. Phys. J. B 70, 185–191 (2009). https://doi.org/10.1140/epjb/e2009-00195-2

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  • DOI: https://doi.org/10.1140/epjb/e2009-00195-2

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