Room-Temperature Observation of Stark Ladder Formation in a Short-Period GaAs/AlAs Superlattice under an Electric Field

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Abstract
First room-temperature observation of the Wannier-Stark localization is reported in a short-period GaAs/AlAs superlattice with a 40-period of 3.2 nm GaAs/0.9 nm AlAs under an electric field by photocurrent spectroscopy. We show clear spectroscopic evidence for the evenly spaced Stark ladder spectra up to the 3rd order due to the Wannier-Stark localization which is in strong contrast to the usual quantum-confined Stark effects. Our results indicate an interesting possibility for application to a new-type electro-optic device based on the Wannier-Stark localization.