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The mesoscopic X-ray edge problem: Boundary effects enhance photoabsorption in quantum dots

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  • Martina Hentschel
  • Georg Röder

Abstract

We investigate the X-ray edge problem and photoabsorption spectra of mesoscopic quantum dot systems, in particular those of rectangular shape. We find strong signatures of Fermi-edge singularities in the photoabsorption cross section that characteristically differ from the well-studied metallic behaviour. The averaged photoabsorption at K-edge, typically rounded in the metallic case, develops a peaked characteristics, comparable to the metallic and mesoscopic L-edge signature, in quantum dots. It stems from the contribution of the system boundary region to the photoabsorption signal and has its origin in the correlation between the single-particle wave functions and their derivatives near a system boundary. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2014

Suggested Citation

  • Martina Hentschel & Georg Röder, 2014. "The mesoscopic X-ray edge problem: Boundary effects enhance photoabsorption in quantum dots," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 87(1), pages 1-6, January.
    • Handle: RePEc:spr:eurphb:v:87:y:2014:i:1:p:1-6:10.1140/epjb/e2013-41013-4
    DOI: 10.1140/epjb/e2013-41013-4
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    Keywords

    Mesoscopic and Nanoscale Systems;

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