Температурно-аномальная диффузия в недодемпфированных периодических системах

Abstract

We have investigated the strengthening of the diffusion of particles in a spatially periodic structures under the influence of periodic in time fields. It is shown that diffusion can be arbitrarily enhanced (many orders of magnitude) in the selection of appropriate temperatures, amplitudes and frequencies of the external field. The physical reason behind the strong diffusivity enhancement is emergence of two populations of partic les under the action of external force, locked and running ones. At optimal forces and temperature the number of particles in the two populations is comparable, long flights of therunning particles relative to the locked population take place with significant probability, resulting in giant enhancement of diffusion. It was found that the amplitudes exceeding the critical level, the temperature dependence in a region temperature abnormal diffusion (TAD) in which the diffusion coefficient increases with decreasing temperature.