Active matter refers to a generic class of nonequilibrium systems that break detailed balance at the level of the individual particles. These systems exhibit many emergent phenomena at large scales like non-equilibrium ordering transitions, the coherent motion of a large number of particles and motility induced phase separation. Active-Brownian-particles (ABPs) and run-and-tumble-particles (RTPs) are the simplest manifestations of scalar active matter. The mean-squared displacement (MSD) of a tagged RTP scales as the square root of time for a large range of densities and tumbling rates of the RTPs. This MSD scales with the particle density, the active speed and the flipping rate of the RTPs. This scaling is valid even in regimes where the RTPs form large aggregates. We found similar kind of scaling behaviour for ABPs confined in a 1-D channel. At a larger level, we have studied the emergent fluctuation-induced interactions between anisotropic inclusions embedded in a nonequilibrium heat bath of ABPs.
Pritha Dolai (ICTS-TIFR, Bangalore)
Date & Time
Fri, 30 November 2018, 11:15 to 12:15
Emmy Noether Seminar Room, ICTS Campus, Bangalore