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Generalized Blonder-Tinkham-Klapwijk theory and conductance spectra with particle-hole mixing interface potential

Author

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  • Marilena Catapano
  • Francesco Romeo
  • Roberta Citro
  • Filippo Giubileo

Abstract

We extend the Blonder-Tinkham-Klapwijk treatment including particle-hole mixing boundary conditions in the Bogoliubov-de Gennes scattering problem to describe anomalous conductance features often reported in normal-metal/superconductor junctions. We calculate the differential conductance spectra and show that conductance dips, not expected in the standard formulation, can be explained in terms of a phase π-shift between the bulk and the interface order parameter. A tight-binding model is also introduced to give a quantitative description of the phase-shift in terms of the transparency and polarization of the interface. We characterize the physics arising from particle-hole mixing boundary conditions at the interface and its effects on the conductance anomalies in superconductor-normal heterostructures. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2015

Suggested Citation

  • Marilena Catapano & Francesco Romeo & Roberta Citro & Filippo Giubileo, 2015. "Generalized Blonder-Tinkham-Klapwijk theory and conductance spectra with particle-hole mixing interface potential," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 88(12), pages 1-8, December.
    • Handle: RePEc:spr:eurphb:v:88:y:2015:i:12:p:1-8:10.1140/epjb/e2015-60574-6
    DOI: 10.1140/epjb/e2015-60574-6
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    Solid State and Materials;

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