Exciton spin manipulation in InAsGaAs quantum dots: Exchange interaction and magnetic field effects

M. Sénès, B. Urbaszek, X. Marie, T. Amand, J. Tribollet, F. Bernardot, C. Testelin, M. Chamarro, and J.-M. Gérard
Phys. Rev. B 71, 115334 – Published 31 March 2005

Abstract

We report quantum beat phenomena between different polarization states in InAs quantum dots, observed in time-resolved photoluminescence and transient dichroism measurements. The polarization of the emitted light can be changed from linear to circular by applying a small magnetic field. Following quasiresonant excitation the electron and hole spin states remain stable during the exciton lifetime, independent of the applied magnetic field. We show that the exciton spin coherence is partially preserved in the energy relaxation process. These experiments enable us to measure the anisotropic exchange energy ΔEXY and the exciton g factor. We find ΔEXY30μeV and g2.5 for the quantum dot excitons.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 23 July 2004

DOI:https://doi.org/10.1103/PhysRevB.71.115334

©2005 American Physical Society

Authors & Affiliations

M. Sénès, B. Urbaszek, X. Marie, and T. Amand

  • Laboratoire de Nanophysique, Magnétisme et Optoélectronique, INSA, 135 avenue de Rangueil, 31077 Toulouse Cedex 4, France

J. Tribollet, F. Bernardot, C. Testelin, and M. Chamarro

  • Groupe de Physique des Solides, Universités Paris-VI et Paris-VII, CNRS UMR 7588, 2 place Jussieu, 75251 Paris Cedex 05, France

J.-M. Gérard

  • Nanophysics and Semiconductors Laboratory, CEA/DRFMC/SP2M, 17, rue des Martyrs, 38054 Grenoble Cedex, France

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 71, Iss. 11 — 15 March 2005

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
×