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

Seufert, J.; Obert, M.; Scheibner, M.; Gippius, N. A.; Bacher, G.; Forchel, A.; Passow, T.; Leonardi, K.; Hommel, D.
August 2001
Applied Physics Letters;8/13/2001, Vol. 79 Issue 7
Academic Journal
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[sup -3] meV/(kV/cm)2 can be extracted, while the permanent dipole moment in the lateral direction is found to be negligible. © 2001 American Institute of Physics.


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