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.

Topics
Time dependent density functional theory, Atom optics, Optical bistability, Photoabsorption, Quantum wells, Density-matrix
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© 2005 American Institute of Physics.
2005
American Institute of Physics
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