Stokes-Einstein-like relation for athermal systems and glasses under shear - art. no. 051202

摘要

Finite temperature and athermal simulations are used to determine the viscosity mu and diffusivity D for systems undergoing shear flow at shear rate gamma and temperature T. Athermal simulations show that musimilar togamma(-1) and Dsimilar togamma due to strain-activated relaxations, leading to an athermal Stokes-Einstein-like relation muD=C-ASE. Finite temperature simulations show that at high T the Stokes-Einstein relation muD=CSET is followed, and as T decreases muD diverges in the Newtonian limit, but muD reaches the constant value C-ASE for finite gamma. These different behaviors of muD suggest that particle dynamics are fundamentally different as jamming is approached by reducing a driving force as opposed to cooling, and that dynamic heterogeneities play a different role in shear-induced dynamics. [References: 26]