Hole coupling in stacked self-assembled InP quantum dots

Hayne, M and Provoost, Rik and Zundel, Markus K and Manz, Yvonne M and Eberl, Karl and Moshchalkov, Victor V (2000) Hole coupling in stacked self-assembled InP quantum dots. Physica E: Low-dimensional Systems and Nanostructures, 6 (1-4). pp. 436-439. ISSN 1386-9477

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We have studied the photoluminescence of doubly stacked layers of InP quantum dots in magnetic fields up to 50T. We find that in contrast to the triply stacked layers studied previously, which were strongly coupled for layer separations of 4 nm or less, the dots in the double layers do not couple. We explain this surprising difference in behaviour by proposing a model in which the holes are confined in the GaInP layers separating the stacked dots. For triply stacked dots two such layers exist, allowing the possibility of coupling via the holes. In doubly stacked dots, there is only one such layer, thus coupling is absent. Our model is consistent with measurements of the exciton masses and radii in the dl,ts, and with calculations of electron and hole wave functions in self-assembled quantum dots. (C) 2000 Elsevier Science B.V. All rights reserved.

Item Type:
Journal Article
Journal or Publication Title:
Physica E: Low-dimensional Systems and Nanostructures
Uncontrolled Keywords:
?? self-assembled quantum dotsinppulsed magnetic fieldsatomic and molecular physics, and opticselectronic, optical and magnetic materialscondensed matter physics ??
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Deposited On:
20 Sep 2011 08:33
Last Modified:
15 Jul 2024 12:19