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      Band-gap renormalization in quantum wire systems: dynamical correlations and multi-subband effects

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      Author(s)
      Güven, K.
      Tanatar, Bilal
      Bennett, C. R.
      Date
      2000
      Source Title
      Journal of Physics Condensed Matter
      Print ISSN
      0953-8984
      Publisher
      Institute of Physics Publishing
      Volume
      12
      Issue
      9
      Pages
      2031 - 2042
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      We study the band-gap renormalization m a model semiconductor quantum wire due to the exchange-correlation effects among the charge carriers. We construct a two-subband model for the quantum wire, and employ the GW-approximation to obtain the renormalized quasi-particle energies at the optical band edge. The renormalization is calculated as a function of electron-hole plasma density and the wire radius. Our results show that the very presence of the second subband affects the renormalization process even in the absence of occupation by the carriers. We compare the fully dynamical random-phase approximation results to the quasi-static case in order to emphasize the dynamical correlation effects. Effects of electron-phonon interaction within the two-subband model are also considered.
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      http://hdl.handle.net/11693/24948
      Published Version (Please cite this version)
      http://dx.doi.org/10.1088/0953-8984/12/9/307
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