We have observed unambiguously the coherent tunneling of photoexcited electrons through an unequal AlₓGa_1-xAs double-barrier superlattice structure. This observation confirms the Fabry-Perot quantum-mechanical interference mechanism in this system. On the basis of this result, a high-responsivity infrared photodetector can be designed with low dark current.
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Choi et al. (1987) studied this question.
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