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Pulsed magnetic fields as a probe of self-assembled semiconductor nanostructures

Hayne, M and Maes, J and Bersier, S and Henini, M and Muller-Kirsch, L and Heitz, R and Bimberg, D and Moshchalkov, V V (2004) Pulsed magnetic fields as a probe of self-assembled semiconductor nanostructures. Physica B: Condensed Matter, 346-34. pp. 421-427. ISSN 0921-4526

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Abstract

Pulsed magnetic fields are used to study a variety of self-assembled semiconductor nanostructures. We illustrate the power of the technique with two recent examples. In the first, we study confinement in InAs quantum dots on (1 0 0) and (3 1 1)B oriented GaAs substrates as a function of InAs coverage. We demonstrate that Stranski-Krastanow growth occurs for (1 0 0) substrates, but show that for (3 1 1)B substrates there is no such transition-rather the dots evolve from fluctuations in the wetting layer. In the second example, we investigate the Coulomb binding of 'free' electrons to holes confined to type-II GaSb/GaAs quantum dots. We find that at low laser power the electrons are repelled from the dots (by strain), but that by optical pumping the dots may be multiply charged, attracting the electrons, and more than doubling the binding energy. (C) 2004 Elsevier B.V. All rights reserved.

Item Type: Article
Journal or Publication Title: Physica B: Condensed Matter
Uncontrolled Keywords: self-assembled quantum dots ; pulsed magnetic fields ; INP QUANTUM DOTS ; MAGNETOPHOTOLUMINESCENCE ; REINFORCEMENT ; CONFINEMENT ; DEPENDENCE ; ELECTRON ; RANGE
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Physics
ID Code: 49487
Deposited By: ep_importer_pure
Deposited On: 12 Aug 2011 09:22
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 19:28
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/49487

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