It is generally believed that collisions of particles reduce the
self-diffusion coefficient. In this book, Erik Kalz shows that in
classical systems under the effect of Lorentz force, which are
characterized by diffusion tensors with antisymmetric elements,
collisions surprisingly can enhance self-diffusion. In these systems,
due to an inherent curving effect, the motion of particles is
facilitated, instead of hindered by collisions. Consistent with this the
author finds that the collective diffusion remains unaffected. Using a
geometric model, he theoretically predicts a magnetic field governed
crossover from a reduced to an enhanced self-diffusion. The physical
interpretation is quantitatively supported by the force autocorrelation
function, which turns negative with increasing the magnetic field. Using
Brownian-dynamics simulations, he validates the predictions.