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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.