Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Quantum Gases (Bosons) II

Q 21.3: Talk

Monday, March 11, 2019, 16:45–17:00, S HS 037 Informatik

Engineering Feshbach resonances by time-periodic driving — •Christoph Dauer, Axel Pelster, and Sebastian Eggert — Physics Department and Research Centre OPTIMAS, Technische Universität Kaiserslautern, Erwin-Schrödinger Straße 46, 67663 Kaiserslautern, Germany

Magnetic Feshbach resonances are a powerful tool in order to control the scattering length in ultracold gas experiments [1], but are limited to given atomic species or applied magnetic field strengths. Here we investigate a periodically driven two-channel model describing magnetic Feshbach resonances using the Floquet formalism [2-4]. Position and width of the resulting resonances, which appear in the scattering length, turn out to be tunable by both driving strength and frequency. An extension of our two-channel model also allows to describe the corresponding case of an optical Feshbach resonance [5], where either the Rabi frequency or the detuning is modulated periodically in time. The goal of these investigations is to check whether the variability of the accessible s-wave scattering lengths can be increased by the time-periodic modulation.

[1] C. Chin et al. Rev. Mod. Phys. 82 1225 (2010).

[2] D.H. Smith. Phys. Rev. Lett. 115, 193002 (2015).

[3] A.G. Sykes, H. Landa, and D.S. Petrov. PRA. 95, 062705 (2017).

[4] S.A. Reyes et al. New J. Phys. 19, 043029 (2017).

[5] O. Thomas et al. Nature Comm. 9, 2238 (2018).