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Magneto-optical properties of ring-shaped self-assembled InGaAs quantum dots

AuthorsHaft, Dirk; Schulhauser, C.; Govorov, Alexander O.; Warburton, Richard J.; Karrai, Khaled; García Martínez, Jorge Manuel ; Schoenfeld, W. V.; Petroff, Pierre M.
Self-assembled systems
Quantum dots
Issue DateMar-2002
CitationPhysica E 13(2-4): 165-169 (2002)
AbstractWe report on measurements of the magneto-optical properties of excitons confined in ring-shaped self-assembled semiconductor quantum dots. The rings are embedded in a field-effect structure that allows the number of confined electrons to be set electrostatically. In addition, electron-hole pairs are generated optically. The resulting photoluminescence spectra of neutral, singly and doubly charged excitons were measured at 4.2 K as a function of the applied magnetic field (0–9 T). The emission energy shows a diamagnetic shift as well as a Zeeman splitting. We measured the emission of different charge states of the exciton in many individual dots. In a few of the measured rings, a new behavior was observed, namely a clear departure from the low field diamagnetic dispersion for fields larger than 6 T.
Description5 páginas, 2 figuras.-- PACS: 78.67.Bf; 73.21.2b, 73.40.Rw; 78.66.Fd.
Publisher version (URL)http://dx.doi.org/10.1016/S1386-9477(01)00511-2
Appears in Collections:(IMN-CNM) Artículos
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