Quantum Light Emission of Two Lateral Tunnel-Coupled (In,Ga)As/GaAs Quantum Dots Controlled by a Tunable Static Electric Field

G. J. Beirne, C. Hermannstädter, L. Wang, A. Rastelli, O. G. Schmidt, and P. Michler
Phys. Rev. Lett. 96, 137401 – Published 4 April 2006

Abstract

Lateral quantum coupling between two self-assembled (In,Ga)As quantum dots has been observed. Photon statistics measurements between the various excitonic and biexcitonic transitions of these lateral quantum dot molecules display strong antibunching confirming the presence of coupling. Furthermore, we observe an anomalous exciton Stark shift with respect to static electric field. A simple model indicates that the lateral coupling is due to electron tunneling between the dots when the ground states are in resonance. The electron probability can then be shifted to either dot and the system can be used to create a wavelength-tunable single-photon emitter by simply applying a voltage.

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  • Received 9 September 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.137401

©2006 American Physical Society

Authors & Affiliations

G. J. Beirne1, C. Hermannstädter1, L. Wang2, A. Rastelli2, O. G. Schmidt2, and P. Michler1

  • 15. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
  • 2Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany

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Issue

Vol. 96, Iss. 13 — 7 April 2006

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