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We show how to compute nonlinear optical absorption spectra of an
Asymmetric Double Quantum Well (ADQW) in the region of
intersubband electronic transitions. The method uses the
microscopic calculation of the dephasing due to electron-electron
and electron-phonon scattering rates and the macroscopic real
density matrix approach to compute the electromagnetic fields and
susceptibilities. The polarization dephasing and the corrections
to the Rabi frequencies due to the electron-electron interaction
are also taken into account. For a proper choice of the QW widths
and of the driving fields we obtain electromagnetically induced
transparency. This transparency has a very narrow linewidth when a
single driving field is applied resonant to the transition between
the second and the third subband. In the case of two resonant
driving fields or of a driving field resonant between the first
and third subband we obtain a large transparency enhancement over
the entire absorption spectrum. Results are given for GaAs/GaAlAs
QWs and experiments are proposed.
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