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MON: Monday Contributed Sessions
MON 21: Quantum Materials
MON 21.4: Talk
Monday, September 8, 2025, 17:15–17:30, ZHG103
Impurity scattering in one-dimensional cavity QED systems — •Lukas I. Krieger1 and Peter P. Orth2 — 1Department of Physics, Saarland University, 66123 Saarbrücken — 2Department of Physics, Saarland University, 66123 Saarbrücken
We consider the effects of impurity scattering in materials strongly coupled to high-finesse electromagnetic cavities. We focus on the regimes of deep to extremely strong coupling between light and matter degrees of freedom, where perturbative methods to cavity QED break down. We use an unitary transformation introduced by Ashida et al. [PRL 126, 153603 (2021)], the asymptotic decoupling (AD) transformation, which shifts the minimal coupling of the vector potential to the momentum to the potential terms describing the influence of periodic crystal lattice and impurities. We consider one-dimensional models of electrons subject to the AD frame light-matter interaction and we analyze the influence of the light-matter coupling to the scattering of electron waves at an impurity site. The impurity scattering will be tackled by perturbation theory in the impurity potential at low orders and by a Green's function treatment to sum up the relevant diagrams contributing to scattering.
Keywords: Cavity QED; Strong coupling; Asymptotic decoupling; Impurity scattering