ONETEP: linear-scaling density-functional theory with plane waves
Peter D. Haynes1, Chris-Kriton Skylaris2, Arash A. Mostofi3 and Mike C. Payne1
1Theory of Condensed Matter, Cavendish Laboratory, University of Cambridge, UK
2Physical and Theoretical Chemistry Laboratory, University of Oxford, UK
3Department of Materials Science and Engineering, Massachusetts Institute of Technology, USA
An overview of the ONETEP (Order-N Electronic Total Energy Package) code is presented, focusing on the twin aims of overall linear scaling and controlled accuracy. The method is outlined, including a description of the density-matrix formulation of density-functional theory, and the optimisation procedures for both the density-kernel and the local orbitals or non-orthogonal generalised Wannier functions. Results of applying the method to a variety of systems are presented to demonstrate the accomplishment of the original aims.