Quenched Disorder-Induced Mobility Decrease with Increasing Channel Width

Seminar
QUEST Center event
No
Speaker
Dan Shafir
Date
24/01/2024 - 11:30 - 10:30Add to Calendar 2024-01-24 10:30:00 2024-01-24 11:30:00 Quenched Disorder-Induced Mobility Decrease with Increasing Channel Width We study the diffusion of a tracer particle with stochastic dynamics confined to a narrow channel while a constant external pulling force is applied. We show that for such geometry, the presence of strong quenched disorder leads to a counterintuitive behavior: the mobility of the particle decreases as the channel width grows. Such an effect only arises when the quenched disorder is sufficiently strong and the diffusion is anomalous. We present a theoretical basis that predicts and explains this effect. The mean position in the presence of a strong quenched disorder is found to have a complex non-linear dependence on the force which results in breaking of the Einstein relation. Room 303 Department of Physics physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Room 303
Abstract

We study the diffusion of a tracer particle with stochastic dynamics confined to a narrow channel while a constant external pulling force is applied. We show that for such geometry, the presence of strong quenched disorder leads to a counterintuitive behavior: the mobility of the particle decreases as the channel width grows. Such an effect only arises when the quenched disorder is sufficiently strong and the diffusion is anomalous. We present a theoretical basis that predicts and explains this effect. The mean position in the presence of a strong quenched disorder is found to have a complex non-linear dependence on the force which results in breaking of the Einstein relation.

Last Updated Date : 17/01/2024