Abstract
We have theoretically studied the shape of the absorption peaks caused by the intersubband transitions of two-dimensional electrons in quantum wells, taking into account the interface roughness through the one-monolayer variation of heteroboundaries. An inhomogeneous broadening of absorption peaks due to the in-plane nonscreened variation of excited levels appears, in good agreement with experimental measurements. We have evaluated the equations for the intersubband polarization by considering the depolarization shift and the exchange contributions. The shape of the absorption peaks is analyzed for the long-range disorder case under the resonant condition of the excitation and for the zero-temperature limit.
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