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S-matrix poles close to thresholds in confined geometries

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  • G. Cattapan
  • P. Lotti

Abstract

We have studied the behavior of the S–matrix poles near threshold for quantum waveguides coupled to a cavity with a defect. We emphasize the occurrence of both dominant and shadow poles on the various sheets of the energy Riemann surface, and show that the changes of the total conductivity near threshold as the cavity's width changes can be explained in terms of dominant to shadow pole transitions. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Suggested Citation

  • G. Cattapan & P. Lotti, 2007. "S-matrix poles close to thresholds in confined geometries," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 60(2), pages 181-185, November.
    • Handle: RePEc:spr:eurphb:v:60:y:2007:i:2:p:181-185
    DOI: 10.1140/epjb/e2007-00337-6
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    Cited by:

    1. G. Cattapan & P. Lotti, 2007. "Fano resonances in stubbed quantum waveguides with impurities," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 60(1), pages 51-60, November.

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