Crystallography on curved surfaces.
We study static and dynamical properties that distinguish 2D crystals constrained to lie on a curved substrate from their flat-space counterparts. A generic mechanism of dislocation unbinding in the presence of varying Gaussian curvature is presented in the context of a model surface amenable to full analytical treatment. We find that glide diffusion of isolated dislocations is suppressed by a binding potential of purely geometrical origin. Finally, the energetics and biased diffusion dynamics of point defects such as vacancies and interstitials are explained in terms of their geometric potential.
Vitelli
Vincenzo
V
Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104-6396, USA. vitelli@sas.upenn.edu
Lucks
J B
JB
Nelson
D R
DR
D003461:Crystallography; D008433:Mathematics; D008962:Models, Theoretical; D013499:Surface Properties