Very strong light-matter coupling in patterned GaAs heterostructures

David de la Fuente Pico; Johannes Bürger; Antonio Gianfrate; Jesper Levinsen; Meera M. Parish; Daniele Sanvitto; Francesca Maria Marchetti; Dario Ballarini

arXiv · 2606.04919

Very strong light-matter coupling in patterned GaAs heterostructures

David de la Fuente Pico·Johannes Bürger·Antonio Gianfrate·Jesper Levinsen·Meera M. Parish·Daniele Sanvitto·Francesca Maria Marchetti·Dario Ballarini

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Abstract

The very strong light-matter coupling regime enables the non-perturbative modification of matter properties via light. Using a patterned GaAs/AlGaAs waveguide with twelve wide quantum wells, we demonstrate hybridization of heavy- and light-hole excitons within a single polariton state and show that, at finite magnetic field, the presence of the light-hole exciton suppresses coupling to the heavy-hole Rydberg excitons and unbound scattering states. We develop a fully microscopic theory that accounts for the combined effects of the magnetic field and light-matter coupling on the excitons, providing an accurate description of the experimental results beyond a perturbative coupled-oscillator framework. This identifies quantum well width as a key control parameter for engineering the light-induced hybridization of matter wave functions in polaritons, which, in turn, can play a crucial role in the optical non-linearities.

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David de la Fuente Pico, Johannes Bürger, Antonio Gianfrate, Jesper Levinsen, Meera M. Parish, Daniele Sanvitto, Francesca Maria Marchetti, Dario Ballarini. 2026-06-03. Very strong light-matter coupling in patterned GaAs heterostructures. https://arxiv.org/abs/2606.04919

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