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Volume dependence of excitonic fine structure splitting in geometrically similar quantum dots

Y. H. Huo, V. Křápek, A. Rastelli, and O. G. Schmidt
Phys. Rev. B 90, 041304(R) – Published 30 July 2014
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Abstract

We investigate the fine structure splitting (FSS) of excitons confined in strain-free, highly symmetric GaAs/AlGaAs quantum dots (QDs) as a function of size. QDs with similar geometry are created by filling nanoholes on an AlGaAs surface with different amounts of GaAs. In turn, nanoholes of regular reversed-cone shape are obtained by Al-droplet etching of an AlGaAs layer. The resulting QDs have high optical quality, as witnessed by emission linewidths smaller than 20 μeV under nonresonant excitation. The average FSS decreases from 12.5 ± 6.4 to 3.6 ± 1.7 μeV as the QD height increases from 5.4 ± 0.3 to 8.0 ± 0.2 nm, following the expected 1/volume dependence. Theoretical calculations using atomic force microscopy data of QD structures as input show that the geometrical similarity of QDs is reflected in invariant aspect ratio and lateral elongation of the wave functions and reproduce the experimental FSS energies.

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  • Received 5 May 2014
  • Revised 7 July 2014

DOI:https://doi.org/10.1103/PhysRevB.90.041304

©2014 American Physical Society

Authors & Affiliations

Y. H. Huo1,*, V. Křápek2, A. Rastelli1,3, and O. G. Schmidt1,4

  • 1Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany
  • 2Central European Institute of Technology, Brno University of Technology, Technická 10, 61600 Brno, Czech Republic
  • 3Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, A-4040 Linz, Austria
  • 4Center for Advancing Electronics Dresden (CfAED), Dresden University of Technology, 01067 Dresden, Germany

  • *y.huo@ifw-dresden.de

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Issue

Vol. 90, Iss. 4 — 15 July 2014

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