High density excitation effects in excitonic diffusion processes in L sub(z)-gradient quantum well

We investigated high density excitation effects in propagation and diffusion processes of free excitons confined in an L sub(z)-gradient GaAs quantum well (QW). From measurements of mu PL spectra, it was found that driving force owing to a confined-energy gradient makes QW excitons propagate asymmet...

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Bibliographic Details
Published inPhysica status solidi. C Vol. 9; no. 12; pp. 2509 - 2512
Main Authors Konishi, Syunya, Nagatomo, Yusuke, Iwamitsu, Kazunori, Shimamoto, Tomoshige, Fujii, Atsuhiro, Akai, Ichiro
Format Journal Article
LanguageEnglish
Published 01.12.2012
Subjects
Asymmetry
Diffusion
Diffusion effects
Excitation
Excitons
High density
Quantum wells
Spectra
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Summary:We investigated high density excitation effects in propagation and diffusion processes of free excitons confined in an L sub(z)-gradient GaAs quantum well (QW). From measurements of mu PL spectra, it was found that driving force owing to a confined-energy gradient makes QW excitons propagate asymmetrically to the falling gradient direction. In addition, it was figured out that many body interactions among the high density QW excitons enhance their isotropic diffusion process in the L sub(z)-gradient QW ( copyright 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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ISSN:1862-6351
1610-1642
DOI:10.1002/pssc.201200178