Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster II

Q 24.7: Poster

Tuesday, March 12, 2024, 17:00–19:00, KG I Foyer

Ultracold Quantum Gases in Spatially and Temporally Engineered Environments — •Erik Bernhart, Marvin Röhrle, Marco Decker, Jian Jiang, and Herwig Ott — Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

Ultracold quantum gas experiments combined with high resolution and highly controllable optical techniques offer a unique platform to study quantum phenomena in driven quantum systems. Here, we report on the experimental realization of a Kapitza trap for ultracold 87Rb atoms, where the dynamical stabilization of the atomic motion by a time periodically modulated potential is demonstrated. While the time average of the potential vanishes, the corresponding Floquet-Hamiltonian results in a non-trivial effective time independent potential, which acts as a trap for the atoms.

To continue the investigations on driven systems and extend them to transport processes in time modulated optical potentials, we have upgraded our setup, which now combines a scanning electron microscope and a high resolution optical objective, through which we can imprint arbitrary repulsive potential landscapes, generated by an AOD. We have implemented a weakly coupled bosonic Josephson junction, with tunable and movable tunneling barrier and benchmark our system by observing the DC Josephson effect.

Keywords: Time modulated Potentials; Floquet Systems; Quantum Transport; Ultracold Quantum Gases