Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 37: Nonlinear Dynamics, Synchronization and Chaos
DY 37.3: Vortrag
Mittwoch, 9. März 2016, 10:30–10:45, H48
Synchronization of particle motion in compressed two-dimensional plasma crystals — •Ingo Laut1, Christoph Räth1, Sergey Zhdanov2, Vladimir Nosenko1, Lénaïc Couëdel3, and Hubertus M. Thomas1 — 1Deutsches Zentrum für Luft- und Raumfahrt, Forschungsgruppe Komplexe Plasmen, Weßling — 2Max-Planck-Institut für Extraterrestrische Physik, Garching — 3CNRS, Aix-Marseille Université, Laboratoire de Physique des Interactions Ioniques et Moléculaires, Marseille, France
Two-dimensional complex plasma crystals are an ideal model system to study dynamic processes on the kinetic level. Recently, synchronized motion of alternating in-phase and anti-phase particle lines was observed during the so-called mode-coupling instability (MCI), where the out-of-plane wave mode of the crystal couples to the longitudinal mode. While MCI is equally strong in three directions for an ideal hexagonal lattice, it was observed in only two directions in the experiment.
Here, we demonstrate with molecular dynamics simulations that an asymmetry in the horizontal confinement of the plasma crystal can cause this anisotropic ignition of MCI. The confinement asymmetry leads to a deformation of the hexagonal lattice that is typically observed in experiments. The instability is accompanied by synchronized particle motion that is characterized by a new order parameter. This order parameter is sensitive to the explicit direction-dependency of the synchronization pattern.