Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 64: Poster II

HL 64.34: Poster

Thursday, March 19, 2020, 10:00–13:00, P1A

Probing the time dynamics of a continuously driven quantum dot under the influence of phonons — •Doris E. Reiter — Institut für Festkörpertheorie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

Semiconductor quantum dots are ideal object to study light-matter interaction in a quantum system. When a quantum mechanical two-level system is driven by a continuous wave excitation after an instantaneous switch on, the dynamics shows Rabi oscillations. These Rabi oscillations could be probed by an ultrashort laser pulse resulting in a Mollow triplet-like spectrum for resonant driving. The Mollow triplet consists of a single peak at the driving frequency and two peaks at the Rabi frequency with half the amplitude. In contrast to an atomic system, the quantum dot is embedded in the solid state matrix and therefore is subject to the interaction with phonons. The electron-phonon interaction results in a damping of the Rabi oscillations and accordingly the optical spectrum after the damping exhibits only the two side peaks. We derive analytical equations to describe both the dynamics and the probe signals of the system within a simple rate equation model. We validate our model by comparison with solution using a standard correlation expansion. The analytical results allow to scrutinize the influence of phonons on optically excited quantum dots.