Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 42: Optical Properties of Quantum dots: Theory and Simulation

HL 42.7: Vortrag

Donnerstag, 28. Februar 2008, 11:15–11:30, EW 201

Input/Output Characteristics of Semiconductor Quantum Dot Lasers — •Christopher Gies, Jan Wiersig, and Frank Jahnke — Institute for Theoretical Physics, University Bremen, 28334 Bremen, Germany

The field of quantum dot- (QD) microcavity lasers is vividly developing. Initial uncertainties in the definition of a laser threshold and discrepancies in the physics of QDs and two-level atoms have lead us to the development of a microscopic semiconductor laser theory. Effects like Pauli blocking, modifications to the source term of spontaneous emission, and the absence of complete inversion in the carrier system can strongly influence the emission characteristics in QD-based systems. Consequently, we find deviations from predictions of atomic laser models and extracted parameters. With respect to the jump in the input/output curve that is dependent on the spontaneous emission factor β, we discuss various effects that lead to differences between the atomic and the semiconductor model. Our applications focus on the influence of pulsed and continuous wave excitation, which is of great relevance for current experiments.