Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 18: Quantum Gases (Bosons) II
Q 18.1: Vortrag
Montag, 5. März 2018, 14:00–14:15, K 2.020
Observation of parametric instabilities in 1D interacting shaken optical lattice systems — •Jakob Näger1,2, Karen Wintersperger1,2, Marin Bokov3, Martin Reitter1,2, Samuel Lellouch4, Ulrich Schneider5, Nathan Goldman4, Immanuel Bloch1,2, and Monika Aidelsburger1,2 — 1Ludwig-Maximilians-Universität München, Schellingstr. 4, 80799 München — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching — 3Boston University, 590 Commonwealth Ave., Boston, MA 02215 — 4Université Libre de Bruxelles, CP 231, Campus Plaine, 1050 Brussels, Belgium — 5University of Cambridge, Cambridge, UK
We study the dynamics of BECs in a driven optical 1D lattice using 39K atoms that have an accessible Feshbach resonance allowing for the control of interactions. The short-time dynamics is mostly dominated by parametric instabilities [1] and can be well described within Bogoliubov theory. At longer times this description seizes to be accurate and the dynamics can be captured by a Fermi*s golden rule approach [2]. We observe the transition between the two regimes for different shaking parameters and interactions. Also, we compare the quasimomentum of the most unstable modes to the values expected from Bogoliubov theory.
[1] S. Lellouch et al., PRX 7, 021015, 2017
[2] M. Reitter et al., PRL 119, 200402, 2017