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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.62: Poster
Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof
A driven-dissipative Bose-Einstein condensate in a 1-D optical lattice — •Marvin Röhrle1, Jens Benary1, Christian Baals1,2, Alexandre Gil Moreno1, Jian Jiang1, and Herwig Ott1 — 1Department of Physics and OPTIMAS research center, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, 55128 Mainz, Germany
We experimentally investigate the behavior of a driven-dissipative Bose-Einstein condensate of weakly interacting 87Rb atoms in a 1-D optical lattice. The dissipation is induced by the electron beam of a scanning electron microscope(SEM) setup, which allows us to observe a single site time resolved. Tunneling from the neighboring sites makes up the driving force. By changing the tunnel coupling J of the lattice, a first order quantum phase transition, from a coherent super fluid phase to an incoherent phase, can be seen. In between the two phases, both branches coexist in a bistable region and depending on the initial state the final state of the system changes. The filling of individual realizations of every experimental run shows a digital behavior. One site is prepared in either the super fluid phase or the incoherent resistive phase and can switch to the other branch within a few tunneling times. When observing the average dynamics over many experimental realizations a critical slowing down can be seen. Furthermore starting from an initially filled site, the losses induce a superfluid current which keeps the site filled. This complete extinction of a matter wave within a medium indicates Coherent Perfect Absorption(CPA).