Collisions enhance self-diffusion in odd-diffusive systems
Abstract
It is generally believed that collisions of particles reduce the self-diffusion coefficient. Here we show that in odd-diffusive systems, which are characterized by diffusion tensors with antisymmetric elements, collisions surprisingly can enhance the self-diffusion. In these systems, due to an inherent curving effect, the motion of particles is facilitated, instead of hindered by collisions leading to a mutual rolling effect. Using a geometric model, we analytically predict the enhancement of the self-diffusion coefficient with increasing density. This counterintuitive behaviour is demonstrated in the archetypal odd-diffusive system of Brownian particles under Lorentz force. We validate our findings by many body Brownian dynamics simulations in dilute systems.
Cite
@article{arxiv.2206.13566,
title = {Collisions enhance self-diffusion in odd-diffusive systems},
author = {Erik Kalz and Hidde Derk Vuijk and Iman Abdoli and Jens-Uwe Sommer and Hartmut Löwen and Abhinav Sharma},
journal= {arXiv preprint arXiv:2206.13566},
year = {2022}
}