Abstract
Ultrafast optical responses of excitons weakly confined in thin GaAs films are observed in a degenerate four-wave mixing experiment. The signal decay, which is attributed to the coherent response from the second quantized level of the center of mass motion, exhibits a nonmonotonic size dependence. The experimental results are explained by calculation results from a mode analysis based on the microscopic nonlocal theory. The decay time agrees well with the calculation of the radiative width of the confined excitons. These results show that strong coupling can be achieved between the radiation field and confined excitons by controlling the size of the thin semiconductor film.
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