Localization of an Exciton in a Quantum Dot Molecule by an ac–dc Electric Field

Authors: Terzis, Andreas F.; Paspalakis, Emmanuel

Source: Journal of Computational and Theoretical Nanoscience, Volume 2, Number 1, March 2005 , pp. 154-160(7)

Publisher: American Scientific Publishers

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Abstract:

We investigate the dynamics of an exciton confined in a symmetric double quantum dot structure under the influence of an ac–dc field. The theoretical analysis is based on two independent methods, a perturbative method and an effective two-level system approach. All analytical results are compared to numerical results of the time-dependent Schrödinger equation for a realistic quantum dot structure whose parameters are derived in the article. It is found that localization can be achieved for quantum dot molecules constructed from a semiconductor of any type, by properly adjusting the parameters of the applied fields. It is also shown that the Coulomb attractive interaction enhances the trapping of the exciton.

Keywords: QUANTUM DOTS; EXCITONS; LOCALIZATION; AC-DC FIELD

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jctn.2005.014

Publication date: 2005-03-01

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Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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