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\subsubsection{\texorpdfstring{Effect of intertube interaction in CNTs}{Effect of intertube interaction in CNTs}}
\label{sec:effect_of_intertube_interaction_in_cnts}


We explored the effect of intertube interaction in bundles of
single-wall CNTs and multiwall CNTs. Because of small intertube
interaction and lattice frustration, we predicted very soft libration
modes to occur and to disappear above the orientational melting
temperature which marks the onset of free tube rotations about their
axis. We also predicted such weak intertube coupling causes an
additional electronic band dispersion of \textless  0.2 eV and opens up a
pseudogap of the same magnitude at the Fermi level in the rope of
(10,10) SWCNTs. In a (5,5)@(10,10) double wall CNT, the weak interwall
interaction and the symmetry reduction causes four pseudogaps to open
and close periodically near the Fermi level during the soft
librational motaion. This electron-libration coupling, absent in
solids composed of fullerenes and SWCNTs, may yield superconductivity
in MWCNTs.

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