
S. SchmittRink, D. S. Chemla, W. H. Knox,
D. A. B. Miller, "How fast is excitonic electroabsorption?"
Optics Letters, 15, 6062, (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 onedimensional model, for which they solve
exactly the timedependent Schrodinger equation. For a homogeneously broadened system, the
electroabsorption response time is found to be simply the inverse of the (fieldinduced)
exciton linewidth, which can be as short as 50 fsec
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