Nonlinear Diamagnetic Interactions in Ultrastrongly Coupled 2D Electrons
- URL: http://arxiv.org/abs/2608.20578v1
- Date: Thu, 20 Aug 2026 21:20:40 GMT
- Title: Nonlinear Diamagnetic Interactions in Ultrastrongly Coupled 2D Electrons
- Abstract summary: We experimentally demonstrate that the diamagnetic response of Landau polaritons is reduced under strong terahertz field excitation.<n>A microscopic hot-electron model reproduces the observed nonlinear response.<n>Our results establish a route toward nonlinear cavity quantum electrodynamics and driven ultrastrong light--matter coupling.
- Score: 8.422569156826798
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: The quantum Hopfield model is widely used to describe ultrastrong light--matter coupling between cavity photons and collective bosonic excitations in solids, where the diamagnetic interaction is conventionally assumed to be a constant. We experimentally demonstrate that the diamagnetic response of Landau polaritons is reduced under strong terahertz field excitation. We show that this behavior originates from field-driven redistribution of electrons into the nonparabolic regime of the conduction band of GaAs, which reduces the plasma frequency and consequently the diamagnetic interaction strength. A microscopic hot-electron model reproduces the observed nonlinear response. Motivated by this microscopic picture, we propose a nonlinear extension of the Hopfield model with a Kerr-like interaction. Our results establish a route toward nonlinear cavity quantum electrodynamics and driven ultrastrong light--matter coupling beyond the conventional linear Hopfield description, which is capable of creating uniquely quantum optical effects such as squeezed light generation.
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