Driven activation versus thermal activation

Details Driven activation versus thermal activation Driven activation versus thermal activation

2007-04-05

arxiv.org/abs/0704.0738v1

EPL 79 (2007) 26001

Physics

Condensed Matter

Statistical Mechanics

5 pages, 3 figures

Scientific paper

10.1209/0295-5075/79/26001

Activated dynamics in a glassy system undergoing steady shear deformation is studied by numerical simulations. Our results show that the external driving force has a strong influence on the barrier crossing rate, even though the reaction coordinate is only weakly coupled to the nonequilibrium system. This "driven activation" can be quantified by introducing in the Arrhenius expression an effective temperature, which is close to the one determined from the fluctuation-dissipation relation. This conclusion is supported by analytical results for a simplified model system.

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