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Current-Voltage Relations in d-wave Josephson Junctions: Effects of Midgap Interface States

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Abstract

We investigate the dc current-voltage characteristics of d-wave Josephson junctions, where the barrier at the interface may have arbitrary strength. Dividing the current into n-particle currents I n (n integer), we can explicitly show which physical processes are responsible for the subharmonic gap structure (SGS). For orientations where midgap states (MGS) exist, the resonances in the n-particle processes are drastically changed, giving rise to a strongly modified SGS. Introducing broadening in a phenomenological way, we show that MGS may produce a current peak near zero bias and we explain which physical processes are contributing to this peak. The agreement of our theory with recent experiments is discussed.

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Authors and Affiliations

  1. Dep. of Microelectronics and Nanoscience, School of Physics and Engineering Physics, Chalmers University of Technology and Göteborg University, S-412 96, Göteborg, Sweden

    T. Löfwander, G. Johansson & G. Wendin

Authors
  1. T. Löfwander
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  2. G. Johansson
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  3. G. Wendin
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Löfwander, T., Johansson, G. & Wendin, G. Current-Voltage Relations in d-wave Josephson Junctions: Effects of Midgap Interface States. Journal of Low Temperature Physics 117, 593–597 (1999). https://doi.org/10.1023/A:1022547901335

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  • DOI: https://doi.org/10.1023/A:1022547901335

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