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Interband and intraband optical transitions in InAs nanocrystal quantum dots: A pseudopotential approach

Puangmali, T., Califano, M. and Harrison, P. (2008) Interband and intraband optical transitions in InAs nanocrystal quantum dots: A pseudopotential approach. Physical Review B, 78 (24). 245104 (pp 10). ISSN 1098-0121

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An atomistic pseudopotential method is used to investigate the electronic and optical properties of spherical InAs nanocrystals. Our calculated interband (valence-to-conduction) absorption spectra reproduce the features observed experimentally both qualitatively and quantitatively. The results relative to intraband (valence-to-valence and conduction-to-conduction) absorption successfully reproduce the recently measured photoinduced absorption spectra, which had so far been addressed only qualitatively. They exclude the hypothesis of a thermal activation process between dot-interior-delocalized hole states to explain the temperature dependence observed experimentally. Furthermore, based on the agreement of our data with the experimental valence intersublevel transitions and the almost complete overlap of the latter with scanning tunneling microscopic (STM) measurements, we question the simplistic attribution of the observed STM peaks obtained for negative bias.

Item Type: Article
Copyright, Publisher and Additional Information: © 2008 The American Physical Society. This is an author produced version of a paper published in 'Physical Review B'. Uploaded in accordance with the publisher's self-archiving policy.
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Microwaves and Photonics (Leeds)
Depositing User: Repository Officer
Date Deposited: 08 Dec 2009 18:03
Last Modified: 08 Feb 2013 17:06
Published Version: http://dx.doi.org/10.1103/PhysRevB.78.245104
Status: Published
Publisher: Americal Physical Society
Refereed: Yes
Identification Number: 10.1103/PhysRevB.78.245104
URI: http://eprints.whiterose.ac.uk/id/eprint/10238

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