CONVERGENCE FROM ATOMISTIC MODEL TO PEIERLS-NABARRO MODEL FOR DISLOCATIONS IN BILAYER SYSTEM WITH COMPLEX LATTICE

In this paper, we prove the convergence from the atomistic model to the Peierls-Nabarro (PN) model of two-dimensional bilayer system with complex lattice. We show that the displacement field and the total energy of the solution of the PN model converge to those of the full atomistic model with second-order accuracy O(epsilon(2)), where epsilon is a small dimensionless parameter characterizing a wide dislocation core with respect to the lattice constant. The consistency of PN model and the stability of atomistic model are essential in our proof. The main idea of our approach is to use several low-degree polynomials to approximate the energy due to atomistic interactions of different groups of atoms of the complex lattice.

Automated summary

In this paper, we prove the convergence from the atomistic model to the Peierls-Nabarro (PN) model of a two-dimensional bilayer system with complex lattice. We suggest an effective approximation method for the energy due to atomistic interactions in different groups of atoms on the complex lattice.