Van der Waals bonding in layered compounds from advanced first-principles calculations

Details Van der Waals bonding in layered compounds from advanced first-principles calculations Van der Waals bonding in layered compounds from advanced first-principles calculations

2012-04-17

arxiv.org/abs/1204.3753v1

Physics

Condensed Matter

Materials Science

Accepted for publication in Physical Review Letters. Includes Supplementary Material

Scientific paper

Although the precise microscopic knowledge of van der Waals interactions is crucial for understanding bonding in weakly bonded layered compounds, very little quantitative information on the strength of interlayer interaction in these materials is available, either from experiments or simulations. Here, using many-body perturbation and advanced density-functional theory techniques, we calculate the interlayer binding and exfoliation energies for a large number of layered compounds and show that, independent of the electronic structure of the material, the energies for most systems are around 20 meV/\AA$^2$. This universality explains the successful exfoliation of a wide class of layered materials to produce two-dimensional systems, and furthers our understanding the properties of layered compounds in general.

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