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HL: Fachverband Halbleiterphysik

HL 64: Poster II

HL 64.28: Poster

Donnerstag, 19. März 2020, 10:00–13:00, P1A

Semiclassical modelling of coupled quantum dot-cavity systems: From polariton-like dynamics to Rabi oscillations — •Kevin Jürgens, Frank Lengers, Tilmann Kuhn, and Doris E. Reiter — Institut für Festkörpertheorie, Universität Münster, Münster

Semiconductor quantum dots (QDs) in a photonic cavity are strongly coupled light-matter systems with numerous applications in quantum information technology. Due to the photonic confinement, the interaction of the QDs with the cavity mode is increased. Here we present a semiclassical model to describe the dynamics of the coupled QD-light system: The QDs are modelled as a planar ensemble of quantum mechanical two-level systems coupled to the electric field and the light field is described by Maxwell’s equations in one dimension. We explicitly take into account the coupling between the QD polarization and the electric field, i.e. we solve the coupled Maxwell-Bloch equations. We show that, depending on the initial value of the light field amplitude, a sharp transition between two regimes with fundamentally different dynamics and spectra emerges. For low amplitudes we find exciton polariton-like dynamics and for high amplitudes Rabi oscillations. The spectrum of the exciton polariton shows the typical anticrossing behavior when tuning the transition frequency of the QD through resonance, and for high amplitudes we see the energy splitting of the dressed states. We confirm our findings in an analytical model.