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Time-resolved dual wavelength studies of optically induced circular dichroism in multiple quantum wells

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6 Author(s)
Holden, T.M. ; Sch. of Phys. & Astron., St. Andrews Univ., UK ; Kennedy, G.T. ; White, S.J. ; Mazilu, M.
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Summary form only given.Previous pump-probe studies of n=1 heavy-hole exciton saturation in room temperature GaAs/AlGaAs MQWs using circular polarizations have quantified the relative contributions of phase-space filling (PSF), screening, and broadening, while electron spin gratings have allowed the measurement of in-well electron mobilities. In this work we extend the use of circular polarizations to nondegenerate studies of GaAs/AlGaAs MQWs employing a dual wavelength, self-mode-locked Ti:sapphire laser to examine (a) the PSF contribution when pumping at the light-hole exciton feature, (b) induced circular dichroism in n=2 excitons, and (c) interband relaxation times.

Published in:

Quantum Electronics Conference, 1998. IQEC 98. Technical Digest. Summaries of papers presented at the International

Date of Conference:

8-8 May 1998