Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 34: Semiconductor Laser
HL 34.8: Vortrag
Mittwoch, 27. Februar 2008, 16:15–16:30, EW 202
Coherence in Optics and Transport in Quantum Cascade Lasers — •Carsten Weber1, Andreas Wacker1, and Andreas Knorr2 — 1Mathematical Physics, Lund University, Box 118, 221 00 Lund, Sweden — 2Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
Quantum cascade lasers have been extensively investigated as prototypes for terahertz and far-infrared intersubband systems in both the transport as well as the linear and nonlinear optical regime. Recent experiments have shown coherent signatures in the optical pump-probe signals, while it is known that in certain regimes, a fully coherent calculation (i.e. beyond Wannier-Stark hopping) is required for a sufficient description of the current. Here, we investigate within a microscopic density-matrix theory the regimes where a coherent description of the optical dynamics and transport properties is necessary. We find that, in general, a coherent description is necessary in order to fully account for the combination of nonlinear dynamical optical and transport properties of the system.