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Optical Matrix Element in InAs/GaAs Quantum Dots: Dependence on Quantum Dot Parameters

Andreev, A D and O'Reilly, E P (2005) Optical Matrix Element in InAs/GaAs Quantum Dots: Dependence on Quantum Dot Parameters Applied Physics Letters, 87 (21). ISSN 00036951

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Abstract

We present a theoretical analysis of the optical matrix element between the electron and hole ground states in InAs/GaAs quantum dots (QDs) modeled with a truncated pyramidal shape. We use an eight-band k center dot p Hamiltonian to calculate the QD electronic structure, including strain and piezoelectric effects. The ground state optical matrix element is very sensitive to variations in both the QD size and shape. For all shapes, the matrix element initially increases with increasing dot height, as the electron and hole wave functions become more localized in k space. Depending on the QD aspect ratio and on the degree of pyramidal truncation, the matrix element then reaches a maximum for some dot shapes at intermediate size beyond which it decreases abruptly in larger dots, where piezoelectric effects lead to a marked reduction in electron-hole overlap.

Item Type: Article
Additional Information: Published in <i>Applied Physics Letters,</i> Vol. 87, Iss. 21. Copyright 2005 American Institute of Physics. Click <a href=http://apl.aip.org/>here</a> to access the journal's webpage.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:09
Last Modified: 23 Sep 2013 18:28
URI: http://epubs.surrey.ac.uk/id/eprint/429

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