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Strain-tunable quantum dot embedded in a nanowire antenna

P. E. Kremer, A. C. Dada, P. Kumar, Y. Ma, S. Kumar, E. Clarke, and B. D. Gerardot
Phys. Rev. B 90, 201408(R) – Published 24 November 2014
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Abstract

We demonstrate an elastically tunable self-assembled quantum dot in a nanowire antenna that emits single photons with resolution-limited spectral linewidths. The single-photon device is composed of a single quantum dot embedded in a top-down fabricated nanowire waveguide integrated onto a piezoelectric actuator. Nonresonant excitation leads to static (fluctuating) charges likely at the nanowire surface, causing DC Stark shifts (inhomogeneous broadening); for low excitation powers, the effects are not observed, and resolution-limited linewidths are obtained. Despite significant strain-field relaxation in the high-aspect-ratio nanowires, we achieve up to 1.2-meV tuning of a dot's transition energy. Single-photon sources with high brightness, resolution-limited linewidths, and wavelength tunability are promising for future quantum technologies.

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  • Received 10 September 2014
  • Revised 5 November 2014

DOI:https://doi.org/10.1103/PhysRevB.90.201408

©2014 American Physical Society

Authors & Affiliations

P. E. Kremer1,*, A. C. Dada1,*, P. Kumar1, Y. Ma1, S. Kumar1, E. Clarke2, and B. D. Gerardot1,†

  • 1Institute of Photonics and Quantum Sciences, SUPA, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
  • 2EPSRC National Centre for III-V Technologies, University of Sheffield, Sheffield S1 3JD, United Kingdom

  • *These authors contributed equally to this work.
  • b.d.gerardot@hw.ac.uk

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Issue

Vol. 90, Iss. 20 — 15 November 2014

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