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Photon-assisted tunneling in a multiple-quantum-well superlattice is enhanced as the photon energy becomes resonant with the first intersubband transition. At resonance the process is characterized by tunneling from real states occupied by photoexcitation. Qualitative differences emerge between photon-assisted tunneling controlled by virtual states, under off-resonance conditions, and photon-assisted tunneling from real states, occupied by photoexcitation when on resonance.
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Vieira et al. (1998) studied this question.
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