Controlling electronic and adiabatic isolation of quantum dots from the substrate : an ionization-energy theoretic study

Arulsamy, Andrew Das & Ostrikov, Kostya (2010) Controlling electronic and adiabatic isolation of quantum dots from the substrate : an ionization-energy theoretic study. Physica B : Condensed Matter, 405(9), pp. 2263-2271.

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Recent controversy on the quantum dots dephasing mechanisms (between pure and inelastic) is re-examined by isolating the quantum dots from their substrate by using the appropriate limits of the ionization energy theory and the quantum adiabatic theorem. When the phonons in the quantum dots are isolated adiabatically from the phonons in the substrate, the elastic or pure dephasing becomes the dominant mechanism. On the other hand, for the case where the phonons from the substrate are non-adiabatically coupled to the quantum dots, the inelastic dephasing process takes over. This switch-over is due to different elemental composition in quantum dots as compared to its substrate. We also provide unambiguous analysis as to understand why GaAs/AlGaAs quantum dots may only have pure dephasing while InAs/GaAs quantum dots give rise to the inelastic dephasing as the dominant mechanism. It is shown that the elemental composition plays an important role (of both quantum dots and substrate) in evaluating the dephasing mechanisms of quantum dots.

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2 citations in Web of Science®

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ID Code: 74705
Item Type: Journal Article
Refereed: Yes
Keywords: Quantum dots, Ionization energy, Electron–phonon interaction, Dephasing mechanism
DOI: 10.1016/j.physb.2010.02.023
ISSN: 0921-4526
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Crown Copyright 2010 Published by Elsevier B.V.
Copyright Statement: This is the author’s version of a work that was accepted for publication in Physica B : Condensed Matter. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Physica B : Condensed Matter, [VOL 405, ISSUE 9, (2010)] DOI: 10.1016/j.physb.2010.02.023
Deposited On: 05 Aug 2014 01:47
Last Modified: 05 Aug 2014 22:42

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