Abstract
The dynamical Stark effect of excitons is investigated in high-quality ZnSe layers by means of one-color pump-and-probe spectroscopy. The Stark shift of free excitons is measured under excitation into the absorption-free energy region between the fundamental 1S and 2S resonances. The sign of the Stark shift is found to be negative which directly contrasts with theoretical predictions based on Hartree-Fock calculations for free excitons.
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