Abstract
On the atomic level, both crystals and disordered solids flow under deformation. Numerical simulations show that, for disordered solids, this flow may be understood in terms of so-called ``soft spots.''
Highlights
Solids flow under shear via localized rearrangements
Manning and Liu [6] used low-frequency quasilocalized modes to construct a population of localized regions, or “soft spots,” which they showed were highly correlated with rearrangements induced by quasistatic shear at zero temperature
By exploring temperatures ranging from those deep in the glassy state to those well within the supercooled liquid regime, we have shown that these correlations are robust; even at the highest temperature considered, we find that rearrangements are about twice as likely to occur at soft spots than they would be if the soft spots were uncorrelated with rearrangements
Summary
Solids flow under shear via localized rearrangements. In crystals, it is known that this flow is achieved via the propagation of topological defects [1]. Manning and Liu [6] used low-frequency quasilocalized modes to construct a population of localized regions, or “soft spots,” which they showed were highly correlated with rearrangements induced by quasistatic shear at zero temperature. Based on a population of localized structural flow defects, or regions of enhanced fluidity, that are prone to rearrangement This is the approach adopted by shear transformation zone theory [10,11] and by mesoscopic kinetic elastoplasticity models [12,13]. This longevity leads to a distribution of soft-spot lifetimes that follows a power law up to the structural relaxation time Together, these two main conclusions provide strong support for a mesoscopic approach to plasticity in glasses that is based on dynamics of the soft-spot population. These results demonstrate the deep and robust connection between soft spots and plasticity in amorphous matter
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