1. Size-filtering effects by stacking InAs/InP (001) self-assembled quantum wires into multilayers
- Author
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Alén, Benito, Martínez Pastor, Juan Pascual, González Sotos, Luisa, García Martínez, Jorge Manuel, Molina, Sergio I., Ponce, Arturo, and García García, Ricardo
- Subjects
Materials science ,Photoluminescence ,Condensed matter physics ,Superlattice ,Exciton ,Quantum wires ,Stacking ,Physics::Optics ,Epitaxy ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Condensed Matter::Materials Science ,Molecular-beam epitaxy ,Transmission electron microscopy ,Multilayer structure ,Homogeneity (physics) ,Molecular beam epitaxy - Abstract
Multilayer structure containing vertically stacked InAs/InP self-assembled quantum wires have been successfully grown by molecular-beam epitaxy. The influence of the InP spacer layer thickness on the structural and optical properties of the wire superlattice has been studied by means of transmission electron microscopy and photoluminescence. The coherent propagation of the strain field in the sample with a 5-nm-thick spacer determines by a size filtering effect a good homogeneity and uniformity of the wire stacks, and hence a good optical quality. The exciton recombination dynamics in the wire superlattice cannot be related to thermal escape of carriers out to the barriers, as occurs in single layer samples., This work has been supported by the spanish CICYT under the Project no. TIC99-1035-C02 and European Commission GROWTH program NANOMAT project, Contract no. G5RD-CT-2001-00545. Authors from University of Cádiz also acknowledge support from the Junta de Andalucía under the group TEP-0120. TEM measuments were carried out in DME, SCCYT, University of Cádiz.
- Published
- 2002