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Author(s)
     Dawei Wang, Margaret Hawton, Marc M. Dignam1
Title
     Excitonic approach to the ultrafast optical response of semiconductors
Publication Name
     Phys. Rev. B
Publication Type
     Journal
Publisher
     APS
Place
      USA
Editor(s)
     
Number
     
School
     
Volume
      76
Chapter
     
Pages
      115311
Other Publication Information
     
Publication Year
     2007
Abstract
     We present a theoretical approach to treating the coherent dynamics of optically generated charge carriers in semiconductors using an excitonic basis. In contrast to the semiconductor Bloch equations, our approach treats intraband correlations without factorization. It also includes phase space filling effects that have generally been omitted in previous excitonic treatments of coherent dynamics. We show that, in the coherent limit, where the intraband dephasing time and population decay time are both equal to half of the interband dephasing time, our excitonic approach agrees with the semiconductor Bloch equations to at least third order in the optical field, but that it differs significantly in more general situations. Our excitonic equations are shown to be particularly applicable in systems, such as biased semiconductor superlattices, where bound excitons dominate the optical response and where intraband correlations play a central role. Using a simple model of a nanoring, we show how the spectral shifts in the interband response can be explained in terms of phase-space-filling-induced excitonic population dynamics.
Keywords
     
Website
     http://link.aps.org/abstract/PRB/v76/e115311
Paper Status
     Published
DOI / Publication ID
     



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