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Advances in Condensed Matter Physics
Volume 2014, Article ID 589415, 9 pages
http://dx.doi.org/10.1155/2014/589415
Research Article

Tunneling Control of Transmission Coefficient and Group Index in a Quantum Dot Nanostructure

1Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, 01108 Vilnius, Lithuania
2Research Institute for Applied Physics, University of Tabriz, Tabriz, Iran
3Department of Physics, Payame Noor University, Tehran 193954697, Iran

Received 15 May 2013; Revised 25 October 2013; Accepted 3 November 2013; Published 29 January 2014

Academic Editor: Oleg Derzhko

Copyright © 2014 Hamid Reza Hamedi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We theoretically study the transmission and group index properties of the probe field in a four-level quantum dot molecule. It is found that the tunnel coupling plays a very important role in realizing the transmission coefficient of the probe field. Moreover, the impact of an incoherent pump field on imaginary part of susceptibility is investigated. We show that probe transmission exhibits oppositional behavior against weak and strong incoherent pump rates. This approach allows substantial flexibility in the manipulation of group velocity of light.