Research Activities > Programs > Nonequilibrium Interface and Surface Dynamics 2007

Modeling Stepped Surfaces across the Scales:
Facet Evolution and Anisotropic Step Stiffness

CSIC Building (#406), Seminar Room 4122.
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Modeling Stepped Surfaces across the Scales: Facet Evolution and Anisotropic Step Stiffness

Professor Dionisios Margetis

University of Maryland


Abstract:  Below the roughening temperature, crystal surfaces evolve via the motion of steps. In this talk I will focus on recent progress and puzzles in answering two questions:

(i) For what continuum theory is step motion a consistent numerical solution scheme ?
(ii) How does one obtain effective material parameters such as the step stiffness from an atomistic, kinetic model?

In (i) I will present 2D continuum laws and discuss facet evolution from a continuum perspective. In (ii) I will discuss the derivation of step stiffness and kinetic rates from a microscopic model for the kinetics of a step edge.
[slides]

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