Eur. Phys. J. B 59, 41-46 (2007)
https://doi.org/10.1140/epjb/e2007-00265-5

Polaron effects on excitons in parabolic quantum wells: fractional-dimension variational approach

Department of Physics, Inner Mongolia University, Hohhot, 010021, P.R. China

Corresponding author: ^a xxliang@imu.edu.cn

Received: 3 April 2007
Revised: 3 August 2007
Published online: 5 October 2007

Abstract

Polaron effects on excitons in parabolic quantum wells are studied theoretically by using a variational approach with the so-called fractional dimension model. The numerical results for the exciton binding energies and longitudinal-optical phonon contributions in GaAs/Al_0.3Ga_0.7As parabolic quantum well structures are obtained as functions of the well width. It is shown that the exciton binding energies are obviously reduced by the electron (hole)-phonon interaction and the polaron effects are un-negligible. The results demonstrate that the fractional-dimension variational theory is effectual in the investigations of excitonic polaron problems in parabolic quantum wells.