Low-temperature photocurrent studies of electron-state coupling in asymmetric coupled quantum wells

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Abstract
We report the results of low-temperature photocurrent studies of an asymmetric coupled-quantum-well system in which the degree of asymmetry is relatively large. A straightforward interpretation of the results in terms of an avoided level crossing of electron states is obtained because the electron levels can be delocalized by application of an electric field, whereas the hole levels remain localized. The optical properties of this system are particularly sensitive to the conduction-band well depth and can therefore be used to determine band offsets.