Issue
EPL
Volume 85, Number 5, March 2009
Article Number 57002
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/85/57002
Published online 17 March 2009
EPL, 85 (2009) 57002
DOI: 10.1209/0295-5075/85/57002

On the theory of two-dimensional combined magnetoexciton-cyclotron resonances

S. A. Moskalenko1, M. A. Liberman2 and I. V. Podlesny1

1   Institute of Applied Physics, Academy of Sciences of Moldova - 5, Academiei str., MD-2028, Chisinau, Republic of Moldova
2   Department of Physics, Uppsala University - Box 530, SE-751 21, Uppsala, Sweden, EU

eboard_mjps@phys.asm.md

received 10 November 2008; accepted in final form 9 February 2009; published March 2009
published online 17 March 2009

Abstract
A theory of combined exciton-cyclotron resonance in the quantum well structures is developed for a strong magnetic field. The absorption band structure is calculated for optical quantum transitions with circularly polarized radiation creating a two-dimensional exciton and simultaneously exciting one of the resident electrons from the lowest to the first Landau level. The dipole-active transitions are considered in the second-order perturbation theory taking into account as perturbations the electron-photon interaction and the electron-electron Coulomb interaction. In agreement with the experimental observation it is shown that for $\sigma ^{-}$ polarized light the probability of quantum transition is four times larger than for $\sigma ^{+}$ light polarization.

PACS
71.35.Cc - Intrinsic properties of excitons; optical absorption spectra.
71.35.Ji - Excitons in magnetic fields; magnetoexcitons.
72.25.Fe - Optical creation of spin polarized carriers.

© EPLA 2009