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Phys. Rev. Lett. 100, 176801 (2008) [4 pages]

Optically Induced Hybridization of a Quantum Dot State with a Filled Continuum

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P. A. Dalgarno1, M. Ediger1, B. D. Gerardot1, J. M. Smith1, S. Seidl2, M. Kroner2, K. Karrai2, P. M. Petroff3, A. O. Govorov4, and R. J. Warburton1
1School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
2Center for NanoScience and Department für Physik, Ludwig-Maximilians-Universität, 80539 München, Germany
3Materials Department, University of California, Santa Barbara, California 93106, USA
4Department of Physics and Astronomy, Ohio University, Athens, Ohio, USA

Received 31 May 2007; revised 14 January 2008; published 28 April 2008

We present an optical signature of a hybridization between a localized quantum dot state and a filled continuum. Radiative recombination of the negatively charged trion in a single quantum dot leaves behind a single electron. We show that in two regions of vertical electric field, the electron hybridizes with a continuum through a tunneling interaction. The hybridization manifests itself through an unusual voltage dependence of the emission energy and a non-Lorentzian line shape, features which we reproduce with a theory based on the Anderson Hamiltonian.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.176801
DOI:
10.1103/PhysRevLett.100.176801
PACS:
73.21.La, 78.67.Hc