Abstract
In the study of exciton motion in semiconductors and molecular crystals, it is usually assumed that the mean free path is sufficiently short compared with the relevant length scale that diffusive behavior, governed by Fick's law, is expected. In this case, the exponential decay in time of an optically created grating (e.g., in four-wave mixing, FWM) has a quadratic dependence on the inverse the text with n = 1.6 (nondiffusive behavior). Solid curve: a quadratic fit, shown for comparison. Upper inset: dependence of the exponent n on the momentum scattering rate as indicated by the absorption linewidth (HWHM). Note the transition to diffusive behavior for larger linewidths (scattering rates).
© 1996 Optical Society of America
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