title: Ripples, strain, and misfit dislocations: structure of graphene-boron nitride superlattice interfaces.
abstract: In recently synthesized two-dimensional superlattices of graphene and boron nitride, the atomic structure of the interface is complicated by a 2% lattice mismatch between the two materials. Using atomistic and continuum analysis, we show that the mismatch results in a competition between two strain-relieving mechanisms: misfit dislocations and rippling. For flat superlattices, beyond a critical pitch the interface is decorated by strain-relieving misfit dislocations. For superlattices that can deform out-of-plane, optimal ripple wavelengths emerge.
authors: Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign , 1206 West Green Street, Urbana, Illinois 61801, United States.
authors: Dinkar
authors: D
authors: Nandwana
authors: Elif
authors: E
authors: Ertekin
keywords: Graphene; heteroepitaxy; hexagonal boron nitride; interface structure; lattice relaxation; misfit dislocations