Relaxation of Crystals with the Quasi-Newton Method

Abstract

A quasi-Newton method is used to simultaneously relax the internal coordinates and lattice parameters of crystals under pressure. The symmetry of the crystal structure is preserved during the relaxation. From the inverse of the Hessian matrix, elastic properties, and some optical phonon frequencies at the Brillouin zone center can be estimated. The efficiency of the method is demonstrated for silicon test systems.

Publication
Journal of Computational Physics, Feb. 1997, vol. 131, (no.1):233-40
Bernd Pfrommer
Bernd Pfrommer
Visiting Scholar

My research interests include computer vision, autonomous systems, and machine learning