Theme 1 colloquium: "Swimming on a sphere - Active-matter dynamics on curved manifolds" (Lecture)
- Tuesday 4 April 2017Add to my calendar
- from 16:00
dr. Liesbeth Janssen (TU/e)
Active matter refers to systems whose constituent agents can move autonomously through the consumption of energy. Examples in nature include bird flocks, bacterial colonies, and the cytoskeleton, but artificial self-propelled particles have also recently become available. The energy dissipation at the single-particle level leads to an intrinsically out-of-equilibrium state, resulting in complex self-organizing behavior that defies the laws of conventional equilibrium statistical physics. In this talk, I will highlight recent results of particle-resolved computer simulations of active rods on a spherical surface . This system exhibits a rich non-equilibrium phase diagram, including a novel self-spinning glass phase that is characterized by strong disorder and persistent collective rotation. By periodically swelling and shrinking the confining sphere, we observe the first signatures of time-dependent aging and rejuvenation in an active glassy material. Overall, these results demonstrate both how concepts of passive glass phenomenology can carry over into the realm of active matter, and how topological constraints may provide new pathways for exploring and controlling the out-of-equilibrium behavior of active and responsive materials.
 L.M.C. Janssen, A. Kaiser, and H. Löwen, arXiv:1611.03528.
dr. Gilles de Wijs