Multilevel infrared coupling of excitons in quantum-well semiconductors

Citation
Sm. Sadeghi et al., Multilevel infrared coupling of excitons in quantum-well semiconductors, IEEE J Q EL, 36(11), 2000, pp. 1267-1271
Citations number
23
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Eletrical & Eletronics Engineeing
Journal title
IEEE JOURNAL OF QUANTUM ELECTRONICS
ISSN journal
00189197 → ACNP
Volume
36
Issue
11
Year of publication
2000
Pages
1267 - 1271
Database
ISI
SICI code
0018-9197(200011)36:11<1267:MICOEI>2.0.ZU;2-Q
Abstract
We study the effects of multilevel mixing of the Is and 2s states of the E1 -HH1 and E2-HH1 excitons in the emission spectra of an undoped quantum well , This is done by investigating the E1-HH1 exciton emission spectra in the presence of an intense CO2 laser near resonance with the transition between El and E2, Our results show that, depending on the frequency of the CO2 la ser, these spectra are quenched peculiarly. We explain these phenomena base d on the frequency dependence of the mixing configurations of the exciton s tates and infrared enhancement of the nonradiative decay rates of E1-HH1 ex citons, We also study the effect of the nonparabolicity of the hole subband (HH1) in the infrared mixing of the E1-HH1 and E2-HH1 excitons.