Title :
Time-resolved dual wavelength studies of optically induced circular dichroism in multiple quantum wells
Author :
Holden, T.M. ; Kennedy, G.T. ; White, S.J. ; Mazilu, Michael ; Miller, Alice ; Allen, J.F.
Author_Institution :
Sch. of Phys. & Astron., St. Andrews Univ., UK
Abstract :
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.
Keywords :
III-V semiconductors; aluminium compounds; carrier relaxation time; circular dichroism; excitons; gallium arsenide; optical pumping; optical saturable absorption; semiconductor quantum wells; time resolved spectra; GaAs-AlGaAs; GaAs/AlGaAs MQW; circular polarizations; interband relaxation times; light-hole exciton feature; multiple quantum wells; nondegenerate studies; optically induced circular dichroism; phase-space filling; pump-probe studies; self-mode-locked Ti:sapphire laser; time-resolved dual wavelength studies; Electron mobility; Electron optics; Excitons; Filling; Gallium arsenide; Optical polarization; Optical pumping; Optical saturation; Quantum well devices; Temperature;
Conference_Titel :
Quantum Electronics Conference, 1998. IQEC 98. Technical Digest. Summaries of papers presented at the International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
1-55752-541-2
DOI :
10.1109/IQEC.1998.680220
