Nonlinear Intersubband Photoabsorption in Asymmetric Single Quantum Wells
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A density-matrix approach combined with time-dependent density-functional theory is used to calculate the intersubband photoabsorption in a strongly driven, DC-biased GaAs/AlGaAs single quantum well. For certain frequencies and intensities of the driving field, optical bistability is observed. Compared to a full time propagation of the density matrix, the commonly used two-level rotating wave approximation becomes less and less accurate for increasing asymmetry.
AIP Conf. Proc. June 30, 2005 Volume 772, pp. 1141-1142