Relative efficiency of transient and stationary changes in excitonic optical properties of InGaAs/InP quantum wells (original) (raw)

Applied Physics Letters, 1995

Abstract

Using an infrared tunable femtosecond source, we investigate the time evolution of exciton absorption bleaching in InGaAs/InP quantum wells at energies slightly below the exciton absorption peak at room temperature. We find that the bleaching due to photogenerated excitons can be stronger than that due to a thermal electron/hole plasma by a factor of 40. Numerical modeling, based on many‐body theory, yields a qualitative explanation of this unusual behavior, along with its density and spectral dependence as well.

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