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Proceedings Paper

A 60 GHz microwave resonance investigation of shallowly formed InAs quantum dots embedded in GaAs
Author(s): Nerija Žurauskienė; Griet Janssen; Etienne Goovaerts; Marek Godlewski; Vitalii Yu. Ivanov; Paul M. Koenraad
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Paper Abstract

Shallowly formed InAs quantum dots (QDs) embedded in GaAs are investigated by Optically Detected Microwave Resonance (ODMR) technique. The low temperature (1.6 K) photoluminescence (PL) spectrum reveals a two-peak structure which is attributed to two different classes of QDs: smaller and larger in size. V-band (60 GHz) ODMR is selectively detected in each of the peaks and depending on the PL detection energy, a different ODMR spectrum is obtained. Detection in the high-energy band reveals a low-field negative signal which is ascribed to cyclotron resonance of the electron in the two-dimensional wetting layer, corresponding to an effective mass of 0.067 m0. The microwave-induced signal at higher fields (~1.1 T) is tentatively attributed to magnetic resonance transitions between spin states of the holes confined in the smaller QDs. When monitoring the emission of the larger QDs, the obtained microwave-induced signal is negative while the resonance line at low field, associated with the cyclotron resonance, is no longer present. The V-band ODMR spectra are compared with W-band (94 GHz) measurements obtained for the same QD structure.

Paper Details

Date Published: 25 January 2007
PDF: 4 pages
Proc. SPIE 6596, Advanced Optical Materials, Technologies, and Devices, 659609 (25 January 2007); doi: 10.1117/12.726363
Show Author Affiliations
Nerija Žurauskienė, Semiconductor Physics Institute (Belgium)
Griet Janssen, Univ. of Antwerp (Belgium)
Etienne Goovaerts, Univ. of Antwerp (Belgium)
Marek Godlewski, Institute of Physics (Poland)
Vitalii Yu. Ivanov, Institute of Physics (Poland)
Paul M. Koenraad, Eindhoven Univ. of Technology (Netherlands)

Published in SPIE Proceedings Vol. 6596:
Advanced Optical Materials, Technologies, and Devices
Steponas Ašmontas; Jonas Gradauskas, Editor(s)

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