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Cancellation of fine-structure splitting in quantum dots by a magnetic field

Research output: Contribution to journalJournal article

Published

  • R. M. Stevenson
  • R. J. Young
  • P. See
  • D. G. Gevaux
  • K. Cooper
  • P. Atkinson
  • I. Farrer
  • D. A. Ritchie
  • A. J. Shields
Journal publication date05/2006
JournalPhysica E: Low-dimensional Systems and Nanostructures
Journal number1-2
Volume32
Number of pages4
Pages135-138
Original languageEnglish

Abstract

We demonstrate control of the fine-structure splitting of the exciton emission lines in single InAs quantum dots by the application of an in-plane magnetic field. The composition of the barrier material and the size and symmetry of the quantum dot are found to determine decrease or increase in the linear polarization splitting of the dominant exciton emission lines with increasing magnetic field. This enables the selection of dots for which the splitting can to be tuned to zero, within the resolution of our experiments. General differences in the g-factors and exchange splittings are found for different types of dot. (c) 2006 Elsevier B.V. All rights reserved.