Stark effect and polarizability in a single CdSe/ZnSe quantum dot

The quantum-confined Stark effect in a single self-assembled CdSe/ZnSe quantum dot was studied by means of highly spatially resolved photoluminescence spectroscopy. A nanotechnological approach making use of a capacitor-like geometry enabled us to apply a well-defined lateral electric field on the q...

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Bibliographic Details
Published in:Applied physics letters 2001-08, Vol.79 (7), p.1033-1035
Main Authors: Seufert, J., Obert, M., Scheibner, M., Gippius, N. A., Bacher, G., Forchel, A., Passow, T., Leonardi, K., Hommel, D.
Format: Article
Language:English
Subjects:
DIPOLE MOMENTS
ELECTRIC FIELDS
EXCITONS
GEOMETRY
PHOTOLUMINESCENCE
PHYSICS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
POLARIZABILITY
SPECTROSCOPY
STARK EFFECT
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Summary:The quantum-confined Stark effect in a single self-assembled CdSe/ZnSe quantum dot was studied by means of highly spatially resolved photoluminescence spectroscopy. A nanotechnological approach making use of a capacitor-like geometry enabled us to apply a well-defined lateral electric field on the quantum dots. Stark shifts of up to 1.1 meV were obtained, which can be well fitted by a purely quadratic dependence on an electric field. In quite good agreement with theoretical calculations, an exciton polarizability of 4.9×10−3 meV/(kV/cm)2 can be extracted, while the permanent dipole moment in the lateral direction is found to be negligible.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1389504