Abstract
Usually, nanotubes are not perfectly straight in electronic transport experiments or in devices because the strong van der Waals interactions with the substrate and metal contacts often cause the nanotube to bend. Meandering of nanotubes on substrates is readily observed, and it originates from deformations of the nanotube introduced during the processing, and that are frozen-in by the interaction with the surface. In addition to changing bond lengths and bond angles, bending can also cause a deformation of the nanotube cross-section, and even cause buckling. Given these possible effects, it is quite surprising that nanotubes are very resistant to bending, even for large bending angles that significantly distort the nanotube cross-section. The evidence for this robustness comes in part from atomistic modeling on specific nanotubes. It is clear from this picture that buckling of the nanotube occurs for bending angles larger than 45 degrees. What is remarkable is that despite this strong distortion of the nanotube structure, the transmission probability of electrons at the Fermi level is essentially unchanged from that of the straight nanotube.
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