Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 3: Active Matter A (joint session DY/CPP)

DY 3.7: Talk

Monday, April 1, 2019, 11:30–11:45, H20

Collapse Dynamics of Polymers with Vicsek-like Activity — •Subhajit Paul¹, Suman Majumder¹, Subir K Das², and Wolfhard Janke¹ — ¹Institute for Theoretical Physics, University of Leipzig, Leipzig, Germany. — ²Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore, India

Many biologically active systems can effectively be understood within the framework of active matter models in statistical physics. In this regard, even modeling a single component Lennard-Jones-type fluid with Vicsek-like activity shows both rich phase and dynamical behavior. Motivated by this we construct a flexible bead-spring polymer model with Vicsek-like activity of the monomer beads. We pay particular emphasis on exploring the pathways of its collapse, following a quench from a high-temperature random coil state into a low-temperature phase where the equilibrium phase is a compact globule in the passive limit of the model. In the active case, however, our results from molecular dynamics simulations reveal that depending upon the strength of activity there is a rich phase behavior of the model that ranges from compact globule to dumbbells. On the nonequilibrium dynamics front, we compare our results with the passive polymer case, from the perspective of various scaling laws related to the collapse time, cluster coarsening, etc.