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Applied Physics Letters / Volume 91 / Issue 5 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 91, 051904 (2007); http://dx.doi.org/10.1063/1.2761522 (3 pages)

Influence of lateral electric fields on multiexcitonic transitions and fine structure of single quantum dots

M. M. Vogel1, S. M. Ulrich1, R. Hafenbrak1, P. Michler1, L. Wang2, A. Rastelli3, and O. G. Schmidt3

1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany
2Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
3Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany

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(Received 22 May 2007; accepted 28 June 2007; published online 31 July 2007)

The quantum-confined Stark effect of excitonic states in self-assembled (In,Ga)As/GaAs quantum dots was studied by microphotoluminescence spectroscopy. A similar Stark-shift behavior for excitons, biexcitons, and a charged state was observed. Investigations suggest the absence of a permanent dipole moment in the lateral quantum dot plane. Values of the polarizability could be derived for all the investigated states. Furthermore, high-resolution Fabry-Pérot interferometry was applied to resolve the excitonic fine structure splitting and to investigate the influence of a lateral electric field. For a single dot, the splitting could be tuned to zero, thus affording the possibility to create electrically controlled entangled photon pairs.

© 2007 American Institute of Physics

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KEYWORDS and PACS

Keywords

biexcitons, Fabry-Perot interferometers, gallium arsenide, III-V semiconductors, indium compounds, photoluminescence, quantum confined Stark effect, self-assembly, semiconductor quantum dots

PACS

  • 73.21.La

    Quantum dots

  • 78.67.Hc

    Quantum dots

  • 73.63.Kv

    Quantum dots

  • 78.55.Cr

    III-V semiconductors

  • 78.20.Jq

    Electro-optical effects

  • 73.20.Mf

    Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2761522

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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