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Center for Nonlinear Studies |
Stochastic thermal forces play a crucial role in the dynamics of point defects and dislocations. When the migration barrier is low, thermal forces give rise to the viscous phonon drag, whilst large barriers are crossed by thermal activation. I will talk about theoretical and numerical techniques developed to capture the forces on crystal defects using Zwanzigs projection technique, how this resolves anomalies in phonon drag theory and allows access to emerging techniques to calculate free energy landscapes. I will also discuss novel simulations and experiments of "self climb", a mechanism of that allows dislocation loops to climb very quickly, independent of any vacancy atomosphere.
Host: Danny Perez