Tuning of the valence band mixing of excitons confined in GaAs/AlGaAs quantum dots via piezoelectric-induced anisotropic strain

J. D. Plumhof, R. Trotta, V. Křápek, E. Zallo, P. Atkinson, S. Kumar, A. Rastelli, and O. G. Schmidt
Phys. Rev. B 87, 075311 – Published 13 February 2013

Abstract

This work presents an experimental method to tune the degree of heavy-hole (HH) and light-hole (LH) mixing of the ground state of quantum dots (QDs). A ferroelectric crystal is used to apply reversible anisotropic biaxial stress to thin nanomembranes, containing GaAs/AlGaAs QDs. The stress-induced modification of the QD anisotropy leads to a change of the relative intensity of the two emission lines produced by the recombination of neutral bright excitonic states. Such a change is ascribed to a variation of the degree of HH-LH mixing. At the same time the modified anisotropy produces a change of the excitonic fine structure splitting (FSS). Model calculations provide a qualitative insight into the relation between strain, HH-LH mixing, and the FSS in epitaxial GaAs/AlGaAs QDs.

  • Figure
  • Figure
  • Figure
  • Received 20 October 2012

DOI:https://doi.org/10.1103/PhysRevB.87.075311

©2013 American Physical Society

Authors & Affiliations

J. D. Plumhof1,*, R. Trotta1,2, V. Křápek3, E. Zallo1, P. Atkinson1,4, S. Kumar1, A. Rastelli1,2, and O. G. Schmidt1

  • 1Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany
  • 2Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstr. 69 A-4040 Linz, Austria
  • 3Institute of Condensed Matter Physics, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
  • 4Institut des Nanosciences de Paris, Université Pierre et Marie Curie, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7588, 4 Place Jussieu, Paris 75005, France

  • *j.plumhof@gmx.de

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 87, Iss. 7 — 15 February 2013

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×