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A particularly promising approach to realize optoelectronic devices based on semiconductor nanostructures are quantum dots coupled to an optical microcavity. Those quantum dot based light emitters are ideal sources for deterministic quantum light emission with tunable photon statistics. This paper investigates the theory of InAs/GaAs quantum dots (QDs) embedded in a two dimensional wetting layer (WL)...
We present a theoretical investigation of the optical properties of an electrically pumped surface-emitting structure composed of quantum dot (QD) layers as active medium and Bragg reflectors. The electric field propagation and the carrier dynamics of QDs embedded into a 2-D wetting layer (WL) are calculated using QD-WL Maxwell-Bloch equations. The equations are evaluated using the finite-difference...
Quantum dot based light emitters can be used as laser and single photon devices. In particular, we focus on the theory of InAs/GaAs quantum dots (QDs) embedded in a two dimensional wetting layer (WL). For simulating real devices, the interactions between electrons and holes confined in the QDs and the wetting layer are important. Therefore, we include Coulomb interaction as well as electron-phonon...
Microscopic calculations of the dynamics of electrically injected carriers, coupled to LO-phonons in Stranski-Krastanov-grown quantum-dot-emitters are presented. Even though the phonon distribution remains in equilibrium, a substantial carrier heating occurs.
We investigated many-body and radiative coupling effects on intersubband Rabi oscillations in a multiple quantum well system. Under certain conditions, radiative coupling is the dominating effect, yielding distinctively different excitation behaviors in the wells.
Using density-matrix theory, the nonlinear optical and transport properties of quantum cascade lasers are investigated. Damping of the optically induced coherence is discussed and experimentally observed wave packet propagation is studied in pump-probe signals.
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