Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: HL Poster II

HL 35.40: Poster

Mittwoch, 3. April 2019, 17:30–20:00, Poster E

Occupation and Light Field Dynamics of a Quantum Dot in a Photonic Cavity — •Kevin Jürgens, Tilmann Kuhn, and Doris E. Reiter — Institut für Festkörpertheorie, Universität Münster, Münster

To enable the use of quantum dots (QDs) as efficient single photon emitters, the QDs are embedded in photonic structures. In such structures the light-matter interaction is enhanced due to the Purcell effect and the QD exciton and light field dynamics are strongly modified.

In this contribution we analyze these dynamics in a semi-classical model, where the QD is described as a two-level system and the light field is treated within the finite-difference time-domain (FDTD) method. The photonic cavity is realized as a defect between two Bragg mirrors. The electric field in this structure induces a polarization in the QD which again couples back in the Maxwell-equations, such that the QD modulates the electric field. This modified field propagates and scatters at the mirrors. Therefore the QD can interact with the self-generated fields resulting in interesting occupation dynamics.

We investigate the combined dynamics of the exciton occupation and the cavity mode induced by a Gaussian pulse and find a transition from exciton-polariton dynamics to Rabi oscillations for increased pulse intensities. These results help in understanding QDs in photonic structures.