Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Quantum Gases: Bosons V

Q 38.5: Talk

Wednesday, March 8, 2017, 15:30–15:45, P 204

Observation of parametric resonances in 1D shaken optical lattices — •Karen Wintersperger^{1, 2}, Jakob Näger^{1, 2}, Martin Reitter^{1, 2}, Ulrich Schneider³, and Immanuel Bloch^{1, 2} — ¹Ludwig-Maximilians-Universität München, Schellingstr. 4, 80799 München — ²Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching — ³University of Cambridge, Cambridge, UK

We study a BEC of 39K with tunable interactions in a shaken 1D optical lattice. Due to the interplay between the external drive and interactions dynamical instabilities arise [1]. The short-time dynamics can be captured by parametric resonances within Bogoliubov theory, which should lead to a fast decay of the BEC. At long times, the behavior will be dominated by collision processes described by a Fermi's Golden rule approach that slow down the decay. Varying the shaking parameters and interactions, we observe the transition between the two heating regimes. Moreover, we can identify the onset of the parametric instabilities at short times by analysing the 2D quasimomentum distribution of the excited atoms.

[1] S. Lellouch et al., arXiv: 1610.02972v1 (2016)