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arXiv · 2204.00594

Attractive trion-polariton nonlinearity due to Coulomb scattering

Kok Wee Song·Salvatore Chiavazzo·Ivan A. Shelykh·Oleksandr Kyriienko
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Abstract

We theoretically investigate the nonlinearity of trion-polaritons in a two-dimensional material that arises from Coulomb interaction between quasiparticles. To evaluate the interaction constant, we solve a three-body Wannier equation precisely by expanding trion wavefunctions into a Gaussian basis. Using these wavefunctions, we calculate the trion-polariton interaction energies for the exchange processes, resolving the outstanding question of trion-trion scattering. We find that the nonlinearity is the result of the competition between different scattering channels. Such a cancellation effect is sensitive to wavefunction overlaps and depends on material parameters. Most importantly, our result shows that the nonlinear interaction between trion-polaritons is attractive, and is fivefold stronger than exciton-polariton interaction. Our work thus describes the regime where trion-polaritons offer the prospects for attractive fluids of light in monolayers of transition metal dichalcogenides.

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Kok Wee Song, Salvatore Chiavazzo, Ivan A. Shelykh, Oleksandr Kyriienko. 2022-07-07. Attractive trion-polariton nonlinearity due to Coulomb scattering. https://arxiv.org/abs/2204.00594

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