Abstract
We present direct evidence for the breakdown of coherent transport through an undoped biased GaAs/AlGaAs superlattice using the technique of hot electron spectroscopy. A three terminal device is used to inject an energy tunable electron beam via a tunneling barrier into a biased superlattice structure. A significant decrease of the total miniband transmission, related to the localization of the superlattice states with increasing electric field is observed. The measured transfer characteristics are compared to the results of a theoretical calculation based on a transfer matrix method using an envelope function approximation. The calculated localization of the electron wave functions and the shift of the superlattice states agrees well with the measured tunneling data.
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