Abstract
Large twist-angle grain boundaries in layered structures are often described by Scherk's first surface, whereas small twist-angle grain boundaries are usually described in terms of an array of screw dislocations. We show that there is no essential distinction between these two descriptions and that, in particular, their comparative energetics depends crucially on the core structure of their screw-dislocation topological defects.
- Received 27 August 1998
DOI:https://doi.org/10.1103/PhysRevLett.82.2892
©1999 American Physical Society