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  • Letter
  • Open Access

Fine structure splitting cancellation in highly asymmetric InAs/InP droplet epitaxy quantum dots

N. R. S. van Venrooij1,2, A. R. da Cruz1,2, R. S. R. Gajjela2, P. M. Koenraad2, Craig E. Pryor1, and Michael E. Flatté1,2,*

  • 1Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA
  • 2Department of Applied Physics, Eindhoven University of Technology, Eindhoven 5612 AZ, The Netherlands

  • *michaelflatte@quantumsci.net
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Phys. Rev. B 109, L201405 – Published 15 May, 2024

DOI: https://doi.org/10.1103/PhysRevB.109.L201405

Abstract

We find the fine structure splitting (FSS) of a single exciton, which splits its degenerate ground-state manifold into singlets, nearly vanishes in highly asymmetric quantum dots (QDs) due to the cancellation of splitting effects with markedly different origin. The dots simulated are those that emerge on top of etch pits through the droplet epitaxy growth process; these etch pit dots break square (C4v) spatial symmetry, which has been previously associated with small FSS. Configuration interaction calculations predict a vanishing FSS at a specific finite etch pit displacement from the center of the dot, for a structure far from square symmetry. We thus predict that highly asymmetric QDs may still display negligible FSS, providing avenues for high-fidelity generation of indistinguishable, polarization entangled photon pairs on demand.

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Outline

Information

Phys. Rev. B 109, L201405– Published 15 May, 2024
  • Received 27 September 2023
  • Revised 7 February 2024
  • Accepted 8 February 2024
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