Photocurrents from quantum wells in asymmetrical-double-barrier resonant-tunneling structures are studied under 9-{μ}m radiation. By use of intersubband transitions, large electron accumulations in the quantum wells are observed directly in one bias polarity, consistent with theory. This photon-assisted resonant-tunneling process may be used for fast-response infrared detection.
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Liu et al. (1991) studied this question.
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