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Title

Vertical stacks of small InAs/GaAs self-assembled dots: resonant and non-resonant excitation

AuthorsMartínez Pastor, Juan Pascual ; Alén, Benito ; Rudamas, C.; Roussignol, Philippe; García Martínez, Jorge Manuel ; González Sotos, Luisa
KeywordsQuantum dots
Photoluminescence
Vertical stacks
Issue DateApr-2003
PublisherElsevier
CitationPhysica E 17: 46-49 (2003)
AbstractWe have performed photoluminescence experiments in samples containing self-assembled quantum dots with different spacer layer thicknesses. A strong filtering effect produced by the GaAs spacer layer on the dots size being stacked is observed for spacers thinner than 10 nm. This effect produces a blue shift of the emission band from stacked dots and a simultaneous line width narrowing. At the same time, given the existence of a broad dot size distribution in the first layer, bigger dots can evolve towards InAs cylinder-like structures, whose emission occurs at appreciably lower energies as compared to the emission band associated to dot stacks (with some GaAs separation).
Description4 páginas, 2 figuras.-- PACS: 78.67.Hc; 73.21.La; 78.55.Cr.-- Proceedings of the International Conference on Superlattices, Nano-structures and Nano-devices ICSNN 2002.
Publisher version (URL)http://dx.doi.org/10.1016/S1386-9477(02)00734-8
URIhttp://hdl.handle.net/10261/32062
DOI10.1016/S1386-9477(02)00734-8
ISSN1386-9477
Appears in Collections:(IMN-CNM) Artículos
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