Investigation of excitonic saturation by time-resolved circular dichroism in GaAs-AlxGa1-xAs multiple quantum wells

M. J. Snelling, P. Perozzo, D. C. Hutchings, I. Galbraith, Alan Miller

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Abstract

Time- and wavelength-resolved circular dichroism of the excitonic saturation in GaAs-AlxGa1-xAs multiple quantum wells at room temperature is investigated using a degenerate excite-probe method. For moderate excitation, the effects of photogenerated carriers on the heavy-hole exciton resonance are separately identified as the contributions of phase-space filling and Coulombic effects (screening and line-shape broadening). These contributions are observed to be of a similar magnitude. The induced circular dichroism of the exciton saturation was observed to decay with a time constant of 50 ps, which is attributable to electron spin relaxation. © 1994 The American Physical Society.

Original languageEnglish
Pages (from-to)17160-17169
Number of pages10
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume49
Issue number24
DOIs
Publication statusPublished - 15 Jun 1994

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