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(Color online) Band structure and wave functions for the investigated terahertz QCL (Ref. 13 ) at a bias drop of per period with the laser levels (4,5) marked (thick lines).
Linear optical absorption spectra of the terahertz QCL from Ref. 13 at different temperatures and an operating bias of . The inset shows the gain peak for the two scattering processes treated independently, electron-phonon (dashed line) and electron-impurity interactions (solid line) at .
(Left) Rabi flopping as well as population relaxation of the five subbands of the QCL from Ref. 13 for a pulse excitation with Gaussian pulse durations of (a) , (b) , and (c) . (Right) Electric field of the corresponding pulses.
Temporal evolution of two subband densities for the situation in Fig. 3(a) showing the effect of the periodically coupled structure for (a) the undamped system and (b) the fully damped system. The dynamics including (thick lines) and excluding (thin lines) interperiodic coherences are shown.
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