Abstract
Ultrafast intersubband excitation of electrons in tunnel-coupled wells is studied inrespect of its dependence on the structure parameters, the duration of the infraredpump and the detuning frequency. The temporal dependences of the photoinducedcarrier concentration and dipole moment are obtained for two cases of transitions:from the single ground state to the tunnel-coupled excited states and from thetunnel-coupled states to the single excited state. The peculiarities of dephasingand population relaxation processes are also taken into account. The nonlinearregime of the response is also considered when the splitting energy between thetunnel-coupled levels is renormalized by the photoexcited electron concentration. Thedependences of the period and the amplitude of oscillations on the excitation pulseare presented with a description of the damping of the nonlinear oscillations.
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