Coherence and relaxation of excitons in transform-limited time-resolved resonant light-scattering

Heinrich Stolz

doi:10.1117/12.175887

6 May 1994 Coherence and relaxation of excitons in transform-limited time-resolved resonant light-scattering

Heinrich Stolz

Proceedings Volume 2142, Ultrafast Phenomena in Semiconductors; (1994) https://doi.org/10.1117/12.175887
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Utilizing transform-limited time-resolved light scattering with simultaneously optimum temporal and spectral resolution, it is possible to investigate on a picosecond time scale energy and phase relaxation processes of excitons in semiconductors. Thereby quantum-beating as a measure of exciton coherence allows us to discriminate Raman scattering from hot luminescence as exemplified for indirect free excitons in AgBr. In order to distinguish resonant Rayleigh scattering occurring in disordered systems from ordinary fluorescence, the experimental setup has to be fully included in the theoretical description of the light scattering process. Experiments at the (n equals 1, e-hh) exciton in GaAs/AlGaAs quantum well structures confirm the predicted finite decay of this process and allow us to measure the exciton relaxation dynamics.

Citation Download Citation

Heinrich Stolz "Coherence and relaxation of excitons in transform-limited time-resolved resonant light-scattering", Proc. SPIE 2142, Ultrafast Phenomena in Semiconductors, (6 May 1994); https://doi.org/10.1117/12.175887

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