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

Dupertuis M.A., Oberli D.Y., Kapon E.
Swiss Federal Institute of Technology-EPFL, CH

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

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)

PDF of paper:

Journal: TechConnect Briefs
Volume: 1, Technical Proceedings of the 2002 International Conference on Modeling and Simulation of Microsystems
Published: April 22, 2002
Pages: 524 - 527
Industry sector: Sensors, MEMS, Electronics
Topic: Modeling & Simulation of Microsystems
ISBN: 0-9708275-7-1