Freiburg 2024 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Poster IV

A 25.7: Poster

Mittwoch, 13. März 2024, 17:00–19:00, Tent A

Theoretical study of radio-frequency induced Floquet-Feshbach resonances in ultracold Lithium-6 gases — •Alexander Guthmann, Felix Lang, and Artur Widera — RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

Feshbach resonances play a crucial role in the exploration of ultracold atoms. The magnetic field position of these resonances is determined by the point at which the energy of a dimer-bound state intersects the asymptotic atomic threshold. This contribution discusses the utilization of an oscillating magnetic field in the radio frequency range to couple colliding atom pairs to the dimer state, generating new resonances at different magnetic field values. Employing Floquet theory, we transform the time-dependent problem into a time-independent equivalent, yielding a Hamiltonian suitable for coupled-channel calculations. Using Lithium-6 as an example, which exhibits a notably broad s-wave resonance at 832G due to a weakly bound halo state, our results from coupled-channel calculations reveal that this halo state enables the creation of radio frequency-induced resonances with significant widths and tunability at modulation strengths achievable in practice. Theoretical findings will be presented, and the feasibility of experimental observation, along with associated technical challenges, will be explored.

Keywords: Feshbach resonances; Floquet; Lithium; Coupled-channel; Radio-frequency