Mainz 2026 – scientific programme

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MO: Fachverband Molekülphysik

MO 3: Collisions, Scattering and Correlation Phenomena I (joint session A/MO)

MO 3.1: Talk

Monday, March 2, 2026, 11:45–12:00, N 2

Floquet Resonances in Ultracold Gas Scattering — •Sebastian Eggert, Axel Pelster, and Christoph Dauer — University of Kaiserslautern-Landau (RPTU)

An alternative mechanism of tuning interactions between cold atoms is proposed, which is based on dynamically creating "Floquet bound states" using time-periodic fields. By developing a Floquet-scattering theory we show that sharp Floquet resonances occur at which the effective interaction can be tuned to very large attractive or repulsive values. The resulting predictions explain recent experimental data and provide additional tuning possibilities. Analytic predictions are given for adjusting amplitude, frequency and mean of the applied oscillating field in order to to accurately choose location and width of scattering resonances over a wide range. This paves the road to a versatile toolbox of tailored interactions in setups with multiple species.

Keywords: Feshbach resonances; Floquet theory; Ultracold collisions; Scattering theory; Cold atoms in external fields