Efficient generation of realistic model systems of amorphous silica

Autor:	Camellone, Matteo Farnesi, Reiner, Joachim, Sennhauser, Urs, Schlapbach, Louis
Rok vydání:	2011
Předmět:	Physics - Computational Physics Condensed Matter - Other Condensed Matter
Druh dokumentu:	Working Paper
Popis:	We used classical molecular dynamics and the van Beest Kramer van Santen (BKS) potential to generate small model systems of amorphous silica. We further optimized the classically equilibrated configurations using plane wave based density functional theory and a generalized gradient (GGA) approximation. Within ab initio treatment we showed that both geometry optimization and Car-Parrinello annealing lead to the same final configurations but the CPU time required for the geometry optimization to reach convergence is one fifth of the time needed by a Car-Parrinello annealing. In addition during the optimization or the annealing no substantial change occurs on the topology acquired by the vitreous silica at the end of the classical quenching protocol. Structural and electronic properties have been calculated and compared to experiments.
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1109.2852 Zobrazit plný text záznamu View this record from Arxiv