Van der Waals interaction in nanotube bundles: consequences on vibrational modes

Physical Review B 60, 8521 - 8524 (1999)

Van der Waals interaction in nanotube bundles: consequences on vibrational modes

L. Henrard, E. Hernández, P. Bernier, A. Rubio

We have developed a pair-potential approach for the evaluation of van der Waals interaction between carbon nanotubes in bundles. Starting from a continuum model, we show that the intertube modes range from 5 cm-1 to 60 cm-1. Using a nonorthogonal tight-binding approximation for describing the covalent intratube bonding in addition, we confirm a slight chiral dependence of the breathing mode frequency and we found that this breathing mode frequency increases by ~10% if the nanotube lies inside a bundle as compared to inside the isolated tube.

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http://dx.doi.org/10.1103/PhysRevB.60.R8521