SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 12: Poster I

A 12.41: Poster

Tuesday, March 7, 2023, 16:30–19:00, Empore Lichthof

Theoretical study of radio-frequency induced Floquet Feshbach resonances in ultracold Lithium-6 gases — •Alexander Guthmann and Artur Widera — Physics Department and Research Center OPTIMAS, University of Kaiserslautern-Landau, Germany

Feshbach resonances are an indispensable tool in the research of ultracold atoms. The position of magnetic Feshbach resonances is determined by the magnetic field value where the energy of a dimer bound state crosses the asymptotic atomic threshold. By applying an oscillating magnetic field in the radio frequency regime, the colliding atom pair can be coupled to the dimer state, and new Feshbach resonances at different magnetic field values can be produced. Using techniques of Floquet theory, we convert the time-dependent problem into an equivalent time-independent problem, and derive a Hamiltonian which can be used for coupled-channel calculations. We use the example of Lithium-6 featuring an unusually broad s-wave resonance at 832G caused by a weakly bound halo state. Results from coupled-channel calculations show that this halo state allows the creation of RF-induced resonances with large widths and tunability at technically achievable modulation strengths. These theoretical investigations will be presented, and the possibilities of experimental observation and associated technical challenges will be discussed.