Past colloquia and seminars


Collisions increase self-diffusion in odd-diffusive systems

Academic or specialist Other

It is generally believed that collisions of particles reduce the self-diffusion coefficient. In this work 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. The physical interpretation is quantitatively supported by the force-autocorrelation function, which turns negative with increasing odd-diffusivity. We validate our findings by many body Brownian dynamics simulations in dilute systems.

When? 12.05.2022 10:15
Where? PER 08 0.58.5
Chemin du Musée 3
1700 Fribourg
speaker Erik Kalz, présentation du travail de Master de Physique
Groupe Brader, Superviseur: Dr Abhinav Sharma
Contact Département de Physique
Prof. Brader