Laboratoire de Physique Théorique

de la Matière Condensée

Cory Hargus (U Paris Cité, labo MSC)

The microscopic origins of odd transport phenomena in chiral active matter

The study of transport phenomena is traditionally concerned with how things spread out over time. Heat flows from hot to cold, mass diffuses from high to low concentration, and fluids flow under an applied shear, dissipating momentum.  In this talk, however, I will describe “odd” (or antisymmetric) transport phenomena, in which currents flow in the perpendicular direction.

Such odd behaviors may challenge our intuition, but in chiral active matter they emerge as a natural consequence of breaking time-reversal and parity symmetries at the level of microscopic fluctuations. This becomes apparent when deriving Green-Kubo relations, which I will present together with numerical simulations, verifying the quantitative connection between these microscopic and macroscopic symmetries. Notably, this connection holds even in active (and thus inherently out-of-equilibrium) systems.

[1] C. Hargus, J. Epstein, K. Mandadapu, Phys. Rev. Lett. 127, 178001 (2021);
[2] C. Hargus, K. Klymko, J. Epstein, K. Mandadapu, J. Chem. Phys. 152, 201102 (2020).