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Electrically driven single photon source based on a site-controlled quantum dot with self-aligned current injection

Unrau, Waldemar; Quandt, David; Schulze, J.-H.; Heindel, Tobias; Germann, Tim David; Hitzemann, Ole; Strittmatter, André; Reitzenstein, Stephan; Pohl, Udo W.; Bimberg, Dieter

Inst. Festkörperphysik

Electrical operation of single photon emitting devices employing site-controlled quantum dot (QD) growth is demonstrated. An oxide aperture acting as a buried stressor structure is forcing site-controlled QD growth, leading to both QD self-alignment with respect to the current path in vertical injection pin-diodes and narrow, jitter-free emission lines. Emissions from a neutral exciton, a neutral bi-exciton, and a charged exciton are unambiguously identified. Polarization-dependent measurements yield an exciton fine-structure splitting of (84 ± 2) μeV at photon energies of 1.28–1.29 eV. Single-photon emission is proven by Hanbury Brown and Twiss experiments yielding an anti-bunching value of g(2)(0) = 0.05 under direct current injection.
  • This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 101, 211119 (2012) and may be found at https://doi.org/10.1063/1.4767525.