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- W1987016885 abstract "Excitonic transitions are observed at 10 K in a 225-AA{} ${mathrm{Al}}_{0.35}$${mathrm{Ga}}_{0.65}$As-GaAs multiple-quantum-well structure in photoreflectance (PR) spectra obtained using a novel double monochromator spectrometer. With an instrumental resolution of 0.06 meV, complete resolution of excitonic line shapes in PR is achieved. The $1s$ and $2s$ states of the lowest-lying heavy- and light-hole free excitons ($1H$ and $1L$) are observed as well as the ground states of two forbidden excitons ($12H$ and $13H$). The PR data are analyzed using an effective-mass theory based on a modulation of the built-in electric field as the dominant modulation mechanism. The measured values of the difference in energy between the $1s$ and $2s$ states of both the heavy-hole free exciton and light-hole free excitons agree with their calculated values. No evidence is observed in PR for contributions of the two-dimensional band-to-band continuum (quantum confined Franz-Keldysh effect). The identification of excitonic features is further supported by comparison with corresponding photoluminescence excitation measurements made on the same sample." @default.
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- W1987016885 date "1989-01-15" @default.
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- W1987016885 title "Excited states of the light- and heavy-hole free excitons observed in photoreflectance" @default.
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- W1987016885 doi "https://doi.org/10.1103/physrevb.39.1442" @default.
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