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Modulated resonant Raman and photoluminescence spectroscopy of Bragg confined asymmetric coupled quantum wells

✍ Scribed by M Levy; R Kapon; A Sa'ar; R Beserman; V Thierry-Mieg; R Planel

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
171 KB
Volume
7
Category
Article
ISSN
1386-9477

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✦ Synopsis

Electronic Bragg mirrors were used to conÿne carriers at energy levels above the barrier height in asymmetric coupled quantum wells. Two classes of above barrier states were resolved by using photoluminescence, photoluminescence excitation and modulated resonant Raman spectroscopy. The ÿrst class is Bragg conÿned levels that are highly localized in the asymmetric quantum wells region and are red shifted when locally excited electric ÿeld is generated in the asymmetric coupled quantum well region. The second class of levels that extend mainly above the re ectors is not shifted when the locally excited ÿeld is generated. This phenomenon is due to the smaller conÿnement of the extended states in the asymmetric quantum well region.

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