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Excitons in self-assembled quantum ring-like structures

AuthorsPettersson, H.; Warburton, Richard J.; Lorke, Axel; Karrai, Khaled; Kotthaus, Jörg P.; García Martínez, Jorge Manuel ; Petroff, Pierre M.
Quantum dots
Issue DateFeb-2000
CitationPhysica E 6(1-4): 510-513 (2000)
AbstractA remarkable morphological change of self-assembled InAs quantum dots takes place during growth if a pause is introduced after overgrowing the dots with a few nm of GaAs. Atomic force microscopy indicates that the shape of the dots changes lens-like to ring-like. We report here the results of capacitance and interband transmission experiments on such ring-like structures embedded in a GaAs matrix. In particular, we compare the electronic properties of conventional dots with those of the rings. Significant changes are found which qualitatively support a quantum ring model.
Description5 páginas, 2 figuras.-- PACS: 73.20.Dx; 71.35.−y; 73.40.Rw; 78.66.Fd.-- Trabajo presentado en el 13th International Conference on the Electronic Properties of Two-Dimensional Systems (EP2DS), Otawa del 1 al 6 de 1999.
Publisher version (URL)http://dx.doi.org/10.1016/S1386-9477(99)00096-X
Appears in Collections:(IMSE-CNM) Artículos
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