Influence of lateral electric field on intraband optical absorption in concentric double quantum rings

Baghramyan, H.M., Barseghyan, M.G., Laroze, D. and Kirakosyan, A.A. (2016) Influence of lateral electric field on intraband optical absorption in concentric double quantum rings. Physica E: Low-Dimensional Systems and Nanostructures, 77, pp. 81-89. (doi: 10.1016/j.physe.2015.11.016)

Abstract

The influence of lateral electric field on one-electron states and intraband absorption in two-dimensional concentric double quantum rings is investigated. The confining potential of the rings is modeled as a double harmonic central potential. Using the exact diagonalization technique, we calculate the dependence of the electron energy spectrum as a function of the electric field strength as well as the inner ring radius. Also, different values of confinement strength are considered. Selection rule is obtained for intraband transitions, caused by the direction of incident light polarization. The intraband absorption coefficient is calculated for different values of electric field strength, inner ring radius, confinement strength and incident light polarization direction. The combined influence of electric field strength and change of confining strength show that while the increment of the first one leads only to blueshift of absorption spectrum, the augment of the second one makes the redshift. In addition, both blueshift and redshift of the spectrum have been obtained with the enlargement of inner ring radius. Finally, we show that the absorption spectrum undergoes redshift by changing the polarization of incident light from x- to y-axis.

• Item Type: Articles
• Additional Information: HMB acknowledges financial support from CONICYT- FONDECYT Postdoctral program fellowship under grant 3150109. The work of MGB was supported by the Ar- menian State Committee of Science (Project no. 13YR- 1C0012). DL acknowledges partial financial support from Basal Program Center for Development of Nanoscience and Nanotechnology (CEDENNA) and UTA-project 8750- 12.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Laroze, Dr David
• Authors: Baghramyan, H.M., Barseghyan, M.G., Laroze, D., and Kirakosyan, A.A.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physica E: Low-Dimensional Systems and Nanostructures
• Publisher: Elsevier BV
• ISSN: 1386-9477
• ISSN (Online): 1873-1759
• Copyright Holders: Copyright © 2016 Elsevier B.V.
• First Published: First published in Physica E: Low-Dimensional Systems and Nanostructures 77:81-89
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher.