Microscopic theory for anomalous transport phenomena in crowded environments

by Dr Alessandro Sarracino (UPMC Univ Paris 06)

Thursday 23 Apr 2015, 12:00 → 13:00 Europe/Rome

Aula 2 (Dipartimento di Fisica - Ed. E. Fermi)

The study of the behavior of a driven tracer in crowded environments plays a central role in several fields, such as active microrheology experiments in complex fluids and general transport phenomena in biological systems. In particular, interesting effects can be observed in the nonlinear response regime, where anomalous behaviors can occur. In this talk, I will discuss some analytical approaches in the context of lattice gases, where the driven tracer interacts with an environment of mobile hardcore obstacles. I will focus on the interesting phenomenon of negative differential mobility, i.e. a nonmonotonic behavior of the force-velocity relation of the tracer, which is controlled by both the density and diffusion time scale of the obstacles.