3 years ago

Atomistic potential for graphene and other sp$^2$ carbon systems.

Konstantinos Papagelis, Costas Galiotis, Zacharias G. Fthenakis, Nektarios N. Lathiotakis, Georgios D. Chatzidakis, George Kalosakas

We introduce a torsional force field for sp$^2$ carbon to augment an in-plane atomistic potential of a previous work (Kalosakas et al, J. Appl. Phys. {\bf 113}, 134307 (2013)) so that it is applicable to out-of-plane deformations of graphene and related carbon materials. The introduced force field is fit to reproduce DFT calculation data of appropriately chosen structures. The aim is to create a force field that is as simple as possible so it can be efficient for large scale atomistic simulations of various sp$^2$ carbon structures without significant loss of accuracy. We show that the complete proposed potential reproduces characteristic properties of fullerenes and carbon nanotubes. In addition, it reproduces very accurately the out-of-plane ZA and ZO modes of graphene's phonon dispersion as well as all phonons with frequencies up to 1000~cm$^{-1}$.

Publisher URL: http://arxiv.org/abs/1711.00249

DOI: arXiv:1711.00249v1

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