Dynamical chiral symmetry breaking in sliding nanotubes

Details Dynamical chiral symmetry breaking in sliding nanotubes Dynamical chiral symmetry breaking in sliding nanotubes

2009-03-09

arxiv.org/abs/0903.1584v1

Phys. Rev. Lett. 102, 125502 (2009)

Physics

Condensed Matter

Materials Science

To appear in PRL

Scientific paper

10.1103/PhysRevLett.102.125502

We discovered in simulations of sliding coaxial nanotubes an unanticipated example of dynamical symmetry breaking taking place at the nanoscale. While both nanotubes are perfectly left-right symmetric and nonchiral, a nonzero angular momentum of phonon origin appears spontaneously at a series of critical sliding velocities, in correspondence with large peaks of the sliding friction. The non-linear equations governing this phenomenon resemble the rotational instability of a forced string. However, several new elements, exquisitely "nano" appear here, with the crucial involvement of Umklapp and of sliding nanofriction.

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