Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 23: Ultra-cold atoms, ions and BEC III (joint session A/Q)
A 23.3: Vortrag
Donnerstag, 17. März 2022, 11:15–11:30, A-H2
Formation of spontaneous density-wave patterns in DC driven lattices - a theoretical study — •Lukas Freystatzky1,2, Vijay Singh1,3, Henrik Zahn4, Marcel Kosch4, Luca Asteria4, Klaus Sengstock1,2,4, Christof Weitenberg2,4, and Ludwig Mathey1,2,4 — 1Zentrum für optische Quantentechnologien, Universität Hamburg, Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Hamburg, Germany — 3Institut für Theoretische Physik, Leibniz Universität Hannover, Hanover, Germany — 4Institut für Laserphysik, Universität Hamburg, Hamburg, Germany
We study the phenomenon of spontaneous density-wave patterns, which emerges in a Bose-Einstein condensate in an optical lattice subjected to a strong DC field, realized by strongly tilting the lattice. We use dynamical classical field simulations and analytical approaches to analyse the out-of-equilibrium dynamics of the system, which shows the emergence of pronounced density-wave patterns that spontaneously break the underlying lattice symmetry. This observation and the corresponding formation and decay time scales of the pattern formation are consistent with the measurements. We identify the dominant processes using Magnus expansion and describe the emergence of the density wave pattern in a perturbative approach.