Dresden 2020 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 48: Statistical Physics far from Thermal Equilibrium
DY 48.10: Talk
Thursday, March 19, 2020, 12:00–12:15, ZEU 147
Dynamics of active hard cross-shaped particles in two-dimensional lattice system — •Rakesh Chatterjee1, Nimrod Segall1, Carl Merrigan1, Kabir Ramola2, Bulbul Chakraborty3, and Yair Shokef1 — 1Tel Aviv University, Israel — 2Tata Institute of Fundamental Research Hyderabad, India — 3Brandeis University, Waltham, USA
We analyse the dynamics of an active tracer particle embedded in a thermal lattice gas. All particles are subject to exclusion up to third nearest neighbours on a square lattice, which leads to slow dynamics at high densities. With no rotational diffusion of the tracer, we derive an analytical expression for the resulting drift velocity of the tracer in terms of non-equilibrium density correlations involving the tracer particle and its neighbours. For the case where the tracer undergoes rotational diffusion, we relate its diffusion coefficient to the thermal diffusion coefficient and drift velocity. We also study dynamics where the rotation of the tracer is limited by the presence of neighbouring particles.
Next we explore phase separation and kinetic arrest when all particles are active and have infinite persistence time of their active orientation. The passive limit of the model quenches into the two-phase coexistence region represent an ageing passive glass. Adding small persistent active bias to the particle dynamics creates states that resemble the passive glass at lower densities. For large active bias, the dense, immobile clusters proliferate until a spanning network bridges the system leading to percolation of an arrested phase.