Invited Abstract Submitted to the NANOTUBE'05 Conference:

The quantum nature of phenomena, which underlies the behavior of nanotubes and other nanostructures, raises new challenges when trying to predict their physical behavior. Due to the unavoidable influence of the measurement process on the result in the quantum regime, predictive calculations on high-performance computers have emerged as a powerful research tool complementing experimental observations.

In this presentation, I will review recent computer simulations, which shed light onto some of the puzzling behavior observed in nanotubes and related carbon nanostructures [1]. Due to the stability of the sp² bond, carbon fullerenes and nanotubes are thermally and mechanically extremely stable and chemically inert. They contract rather than expand at high temperatures, and are unparalleled thermal conductors. Nanotubes may turn into ballistic electron conductors or semiconductors, and even acquire a permanent magnetic moment. In nanostructures that form during a hierarchical self-assembly process, even defects may play a different, often helpful role. sp² bonded nanostructures may change their shape globally by a sequence of bond rotations, which turn out to be intriguing multi-step processes. At elevated temperatures or following photo-excitation, efficient self-healing processes may repair defects, thus answering an important concern of molecular electronics.

[1] David Tomanek, Carbon-based nanotechnology on a supercomputer. Topical Review, J. Phys.: Condens. Matter 17, R413-R459 (2005).

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