Hannover 2020 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 13: Posters: Quantum Optics and Photonics I
Q 13.7: Poster
Montag, 9. März 2020, 16:30–18:30, Empore Lichthof
A two-dimensional box trap for bosons with tuneable interactions — •Julian Schmitt, Panagiotis Christodoulou, Maciej Galka, Nishant Dogra, Jay Man, and Zoran Hadzibabic — Cavendish Laboratory, University of Cambridge, UK
Ultracold atoms constitute a powerful platform to study strongly-correlated many-body physics due to the high level of control of their confinement, interactions and dimensionality. While interacting three-dimensional Bose gases exhibit superfluidity induced by Bose-Einstein condensation, two-dimensional Bose gases may become superfluid via the Berezinski-Kosterlitz-Thouless (BKT) mechanism, as observed in e.g. harmonically trapped gases. Probing the nature of the phase transition and the role of interactions, however, has been hampered by the inhomogeneous density distributions of these samples. In this poster, I will present our experimental implementation of a uniform two-dimensional superfluid Bose gas in an optical box trap, which provides access to the thermodynamics and genuine out-of-equilibrium dynamics over the entire system size. The two-dimensional confinement of the gas is realised by repulsive light sheets that allow to dynamically change the trap frequency using a digital micromirror device (DMD). Similarly, the in-plane variable box potential is derived from another DMD acting as an amplitude mask. Finally, our 39K sample allows us to also vary the atomic interactions by employing a magnetic Feshbach resonance. Using the highly tuneable platform, we determine the thermodynamic equation of state of the gas and investigate the elementary excitations by driving the system out of equilibrium.