Asymptotics of the dispersion interaction: analytic benchmarks for van der Waals energy functionals

Physical Review Letters 96, 73201 (2006)

Asymptotics of the dispersion interaction: analytic benchmarks for van der Waals energy functionals

J. Dobson, A. White, A. Rubio

We show that the usual sum of R−6 contributions from elements separated by distance R can give qualitatively wrong results for the electromagnetically non-retarded van der Waals interaction between non-overlapping bodies. This occurs for anisotropic nanostructures that have a zero electronic energy gap, such as metallic nanotubes or nanowires, and nano-layered systems including metals and graphene planes. In all these cases our analytic microscopic calculations give an interaction falling off with a power of separation different from the conventional value. We discuss implications for van der Waals energy functionals. The new nanotube interaction might be directly observable at sub-micron separations.

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arxiv
http://arxiv.org/abs/cond-mat/0507156

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