Physics Chat
A Biexciton Extension to the Jaynes-Cummings Model Describing the Quantum-Dot Microcavity System
Speaker: Thomas Allcock (EM)
Date: Friday 6 November 2020
Time: 15:00
Venue: Zoom
The Jaynes-Cummings model(JCM) describes the interaction between a two-level(2L) exciton system present inside a quantum dot coupled to a bosonic cavity mode. Degenerate N-wave mixing(NWM) dynamics are studied, which involve two-photon transitions, implying the quantum dot could be excited further into a biexciton. This work looks at extending JCM to study a three level(3L) exciton-biexciton system, a simplification of a four level scheme valid for linearly polarised light. At low intensities, the Four Wave Mixing(FMW) dynamics is described by 8 optical transitions, two between ground and first rungs of the JCM ladder, and six between the first and second. NWM is described by the 3L model but requires more rungs of the 3L ladder. By varying the 3L model's parameters eg. exciton and biexciton coupling to the cavity and exciton/biexciton/cavity energies and dampings, we gain an understanding of the role of the biexciton in this system.
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