,Dynamic dc voltage band in vertical transport of superlattices

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By the numerical method, we show a transition process from static to dynamic electric-field domain formation in semiconductor superlattices. During this transition, there can be noticed a sawtooth-like zone in which static and dynamic electric-field domain zones appear alteatively with increasing voltage. Therefore, a dynamic dc voltageb and emerges from each sawtooth-like branch of the current-voltage characteristic. These results are qualitatively in agreement with experiment.
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