Voltage-Controlled Optics of a Quantum Dot

Alexander Högele, Stefan Seidl, Martin Kroner, Khaled Karrai, Richard J. Warburton, Brian D. Gerardot, and Pierre M. Petroff
Phys. Rev. Lett. 93, 217401 – Published 18 November 2004

Abstract

We show how the optical properties of a single semiconductor quantum dot can be controlled with a small dc voltage applied to a gate electrode. We find that the transmission spectrum of the neutral exciton exhibits two narrow lines with 2μeV linewidth. The splitting into two linearly polarized components arises through an exchange interaction within the exciton. The exchange interaction can be turned off by choosing a gate voltage where the dot is occupied with an additional electron. Saturation spectroscopy demonstrates that the neutral exciton behaves as a two-level system. Our experiments show that the remaining problem for manipulating excitonic quantum states in this system is spectral fluctuation on a μeV energy scale.

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  • Received 17 June 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.217401

©2004 American Physical Society

Authors & Affiliations

Alexander Högele1, Stefan Seidl1, Martin Kroner1, Khaled Karrai1, Richard J. Warburton2, Brian D. Gerardot3, and Pierre M. Petroff3

  • 1Center for NanoScience and Department für Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany
  • 2School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
  • 3Materials Department, University of California, Santa Barbara, California 93106, USA

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Issue

Vol. 93, Iss. 21 — 19 November 2004

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