We report subband resonances related to higher energy subbands in a series of $\mathrm{Ga}\mathrm{As}∕\mathrm{Al}\mathrm{As}$ asymmetric double quantum well superlattice (ADQW-SL) systems under electric field. Various phenomena can be observed in these ADQW-SL systems, such as the $\Gamma \text{−}X\text{−}\Gamma$ electron resonance and transport, hole subband resonance, phonon replica, and $\Gamma \text{−}\Gamma$ anticrossings. These resonances greatly affect photoluminescence properties, photocurrent-voltage characteristics, and photocurrent impulse responses. We also investigated the $X\text{−}\Gamma$ transfer mechanism in these systems.

• Received 18 August 2005

DOI:https://doi.org/10.1103/PhysRevB.73.165329