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DY: Fachverband Dynamik und Statistische Physik
DY 26: Brownian Motion, Transport and Anomalous Diffusion
DY 26.1: Vortrag
Dienstag, 17. März 2020, 10:00–10:15, HÜL 186
Topological solitons driven through grain boundaries — •Xin Cao1, Emanuele Panizon1,2, and Clemens Bechinger1 — 1Fachbereich Physik, Universität Konstanz, 78464 Konstanz, Germany — 2International School for Advanced Studies (SISSA), Via Bonomea 265, 34136 Trieste, Italy
Topological solitons, or kinks, widely exists in materials and at interfaces. They play important roles in the elastic deformation of metals and alloys and in the mobility of nano contacts. Here, by driving such solitons through grain boundaries in colloidal crystals, we study the influence of such boundaries to the dynamics of solitons. We show that when small solitons are travelling through the grain boundaries, their motion is delayed at the grain boundary with the delay time depending on the driving force. In contrast large extended solitons are splitted upon approaching grain boundaries. Afterwards they split into several smaller solitons due to variations in the delay times at different regions of the grain boundary. At small driving forces, solitons are not able to cross grain boundaries which leads to their accumulation (pile up) at these locations. In addition to the time delay, splitting and pile up of solitons, we also found that the grain boundary can reflect incoming solitons when driving forces are parallel to the grain boundary. Such reflections strongly depend on the mismatch of lattice orientations at the grain boundary and can be used for the controlled guiding of solitons.