Scale Separation of Shear-induced Criticality in Glasses

Abstract

In a sheared steady state, glasses reach a nonequilibrium criticality called yielding. In this letter, we report that the qualitative nature of this nonequilibrium critical phenomenon depends on the details of the system and that responses and fluctuations are governed by different critical correlation lengths in specific situations. This scale separation of critical lengths arises when the screening of elastic propagation of mechanical signals is not negligible. We also explain that the impact of the screening effects is crucially determined by the microscopic dissipation mechanism.