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A: Fachverband Atomphysik

A 21: Poster – Atomic Systems in External Fields

A 21.3: Poster

Wednesday, March 4, 2026, 17:00–19:00, Philo 1. OG

Suppression and revival of Floquet-Feshbach resonances — •Louisa Marie Kienesberger, Alexander Guthmann, Felix Lang, Vicente Baca, David Lang, Eleonora Lippi, and Artur Widera — RPTU University

Resonant scattering is a central concept in physics, providing a powerful tool on interaction dynamics from nuclear reactions to ultracold quantum gases. In ultracold atomic systems, magnetically tunable Feshbach resonances enable precise and flexible control over interaction strengths. Recently, we demonstrated that Floquet engineering of two-body interactions via periodically modulated magnetic fields enables the creation of additional, tunable Feshbach resonances [1].

In this contribution, we investigate the behaviour of these Floquet-Feshbach resonances as a function of the modulation strength and identify a characteristic Bessel-function dependence, where the order of the Bessel function corresponds to the order of the Floquet-Feshbach resonance. These Bessel functions define how the widths and amplitudes of the individual Floquet-Feshbach resonances vary with modulation amplitude and frequency, providing a simple handle to enhance or suppress specific resonances. Furthermore, these studies offer insight into Floquet-induced scattering dynamics and support the tailored control of atomic interactions required for quantum simulations of complex many-body systems and the exploration of exotic quantum phases.

[1] A. Guthmann, F. Lang, L. M. Kienesberger, S. Barbosa, and A. Widera, Floquet engineering of Feshbach resonances in ultracold gases, Science Advances 11, eadw3856 (2025).

Keywords: Floquet; Fesbach resonance; ultracold; quantum gas