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Exciton-photon dynamics in quantum dots embedded in photonic cavities

Allcock, Thomas 2020. Exciton-photon dynamics in quantum dots embedded in photonic cavities. PhD Thesis, Cardiff University.
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Abstract

We develop an exact analytical approach to four-wave mixing and higher-order optical nonlinearities of a quantum dot-microcavity system. This approach allows us to analyse the non-linear response in terms of coherent transitions between rungs of the Jaynes-Cummings ladder, finding their complex amplitudes and frequencies. Increasing the pulse area of the excitation field, a transition from quantum strong coupling to coherent classical regime is observed, which manifests itself in a formation of the famous Mollow triplet, with the observation in the three-level model of a quantum dot, including a biexciton, to predict two new effects: One is the existence of a Mollow-like quintuplet, the other is a complete elimination of the four-wave-mixing optical non-linearity under certain parameter constraints. We further develop a simple and accurate approximation in the low-damping limit of the Jaynes-Cummings model of the quantum dot-microcavity system, for nonlinear response of any order in a closed analytic form, predicting the positions and widths of the spectral lines. For higher damping, we demonstrate a strong relaxation down the ladder, shown by both numerical and analytic calculation.

Item Type: Thesis (PhD)
Date Type: Completion
Status: Unpublished
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: exciton photon quantum dot cavity field lindblad master equation pulse biexciton mollow triplet electrodynamics qed quintuplet qubit two level three semiconductor jaynes cummings ultrashort optical polarisation microcavity four wave mixing analytic optics eigen
Funders: Cardiff University, College of Physical Sciences
Date of First Compliant Deposit: 1 July 2021
Last Modified: 01 Jul 2022 01:30
URI: https://orca.cardiff.ac.uk/id/eprint/142275

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