Nanotech 2002 Vol. 2
Nanotech 2002 Vol. 2
Technical Proceedings of the 2002 International Conference on Computational Nanoscience and Nanotechnology

Quantum Effects, Quantum Devices and Spintronics Chapter 9

Computing Excitons in V-shaped Quantum Wires Including Band-Structure and Dielectric Effects : Binding energies and polarization anisotropy of the bright A1, B1, A2 excitons

Authors: M.A. Dupertuis, D.Y. Oberli and E. Kapon

Affilation: Swiss Federal Institute of Technology-EPFL, Switzerland

Pages: 227 - 230

Keywords: quantum wires, excitons, finite elements, polarization anisotropy, Hartree-Fock

We demonstrate an efficient numerical scheme for the computation of the excitonic optical response of actual GaAs/AlGaAs quantum wire structures including a large set of relevant effects; structural, valence band-mixing, dielectric and many-body effects can be accounted for. The optical response of excitons within k.p envelope function and Hartree-Fock approximation, are computed with band-mixing effects by stream-lined finite element techniques. The quantum-mechanical effects linked to the wire symmetry are also explicitely taken into account for the first time. A detailed comparison with relevant experimental PLE results is made, and a good agreement is obtained, including polarization anisotropy and binding energies of all bright excitons (A1, B1, A2)

ISBN: 0-9708275-6-3
Pages: 504