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Resonant tunneling is known to lead to negative differential resistance in double-barrier diodes. Sequential tunneling has been proposed by S. Luryi Appl. Phys. Lett. 47, 490 (1985) as an alternative mechanism for the negative differential resistance observed. We show that the two interpretations lead to the same predictions for the dc current.
Weil et al. (Mon,) studied this question.
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