Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 43: Superconducting Electronics: Qubits
TT 43.12: Vortrag
Mittwoch, 11. März 2026, 12:30–12:45, CHE/0089
Light-controlled transport across impurities in cavity quantum materials — Lukas Krieger1, •Debashish Mondal1,2, Ahana Chakraborty3, and Peter P. Orth1,2 — 1Department of Physics, Saarland University, Campus, 66123 Saarbrücken, Germany — 2Center for Quantum Technologies (QuTe), Saarland University, Campus, 66123 Saarbrücken, Germany — 3Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
We investigate quantum materials placed inside optical cavities in the deep-strong and ultra-strong light-matter coupling regimes. In these regimes, standard perturbative techniques and aprroximation from quantum electrodynamics usch as rotating-wave approximation become unreliable. To address this challenge, we employ the asymptotic decoupling (AD) transformation, a unitary approach that shifts the minimal-coupling interaction to the renormalization of electronic mass and shift of the electronic position.
We examine how strong light-matter coupling affects electron scattering at the impurity site in a one dimensional system. We are analyzing these effects using both low-order perturbation theory and Green-function-based methods to capture higher-order scattering contributions. This work aims to build a framework for understanding scattering phenomena in cavity-embedded quantum materials and to guide future simulations and analytical studies in non-perturbative coupling regimes.
Keywords: Cavity quantum material; Light-matter interactions; Quantum electrodynamics; Quantum scattering; Green-function-based method