Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 70: Ultracold Atoms II (joint session Q/A)
Q 70.2: Talk
Friday, March 9, 2018, 10:45–11:00, K 1.022
Tuning the Scattering Length by Periodic Modulation — •Christoph Dauer, Axel Pelster, and Sebastian Eggert — Physics Department and Research Center OPTIMAS, Technical University of Kaiserslautern, Erwin-Schrödinger Straße 46, 67663 Kaiserslautern, Germany
We consider the scattering problem of two ultracold particles with a small time-periodic modulation of the attractive potential, which can be achieved by using a Feshbach resonance. The steady state is described by the Floquet formalism, which leads to a recurrence formula for an effective scattering length aeff. For frequencies corresponding to the bound-state of the potential without driving, we observe strong resonances, which allow the tuning to very large positive and negative values of aeff with relatively small imaginary parts.