||S. Schmitt-Rink, D. S. Chemla, W. H. Knox,
D. A. B. Miller, "How fast is excitonic electroabsorption?"
Optics Letters, 15, 60-62, (1990).
Many semiconductor light modulators
rely on changes in excitonic absorption induced by electric fields. The authors study
their temporal response in the framework of a one-dimensional model, for which they solve
exactly the time-dependent Schrodinger equation. For a homogeneously broadened system, the
electroabsorption response time is found to be simply the inverse of the (field-induced)
exciton linewidth, which can be as short as 50 fsec
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