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Q: Fachverband Quantenoptik und Photonik

Q 57: Quantum Gases II

Q 57.4: Poster

Donnerstag, 17. März 2022, 16:30–18:30, P

Investigation of Josephson vortices in coaxial ring-shaped Bose-Einstein condensates — •Dominik Pfeiffer¹, Ludwig Lind¹, Daniel Derr¹, Gerhard Birkl¹, Nataliia Bazhan², Yelyzaveta Nikolaieva², Anton Svetlichnyi², and Alexander Yakimenko² — ¹Institut für Angewandte Physik, TU Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt, Germany — ²Department of Physics, Taras Shevchenko National University of Kyiv, Kyiv 01601, Ukraine

Josephson vortices (JV) attract considerable interest due to their perspectives for application in ultra-sensitive rotation sensors and quantum information processing systems. Remarkably, Josephson vortices, being extensively investigated for decades, have not yet been demonstrated experimentally in atomic BECs. The first direct observation of rotational JVs in bosonic junctions now appears as a realistic goal. We investigate the generation of JVs between two coaxial toroidal BECs coupled in a coplanar and in a vertically stacked system. In both systems we generate counter-rotating flows and demonstrate the formation of the JVs. Our results open up a way to the first direct experimental observation of rotational JVs in atomic BECs. We present experimental schemes for the creation of two coupled coaxial rings in a coplanar system based on optical dipole potentials and ultra cold-atoms. Utilizing a digital micromirror device, arbitrary topological charges can be accessed and imprinted onto the coaxial rings. We investigate the feasibility of these techniques to create the desired states, atom distributions, and dynamic behavior.