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arXiv · 2008.09281

Enhanced scattering between electrons and exciton-polaritons in a microcavity

Guangyao Li·Olivier Bleu·Meera M. Parish·Jesper Levinsen
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Abstract

The interplay between strong light-matter interactions and charge doping represents an important frontier in the pursuit of exotic many-body physics and optoelectronics. Here, we consider a simplified model of a two-dimensional semiconductor embedded in a microcavity, where the interactions between electrons and holes are strongly screened, allowing us to develop a diagrammatic formalism for this system with an analytic expression for the exciton-polariton propagator. We apply this to the scattering of spin-polarized polaritons and electrons, and show that this is strongly enhanced compared with exciton-electron interactions. As we argue, this counter-intuitive result is a consequence of the shift of the collision energy due to the strong light-matter coupling, and hence this is a generic feature that applies also for more realistic electron-hole and electron-electron interactions. We furthermore demonstrate that the lack of Galilean invariance inherent in the light-matter coupled system can lead to a narrow resonance-like feature for polariton-electron interactions close to the polariton inflection point. Our results are potentially important for realizing tunable light-mediated interactions between charged particles.

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Guangyao Li, Olivier Bleu, Meera M. Parish, Jesper Levinsen. 2021-04-15. Enhanced scattering between electrons and exciton-polaritons in a microcavity. https://doi.org/10.1103/physrevlett.126.197401

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