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Hofstadter butterflies of carbon nanotubes and graphitic structures (TT 27.6 switched with HL 49.3)
N. Nemec, G. Cuniberti
Deutsche Physikalische Gesellschaft, AKF Frühjahrstagung 2007 German Physical Society, Spring Meeting 2007
2007.03.26-30; Regensburg, Germany
| The electronic spectrum of a two-dimensional square lattice in a perpendicular magnetic field has become known as the Hofstadter butterfly [Hofstadter, Phys. Rev. B 14, 2239 (1976)]. We have calculated quasi-one-dimensional analogs of the Hofstadter butterfly for carbon nanotubes (CNTs) and graphene. Single-wall CNTs and graphene nanoribbons in perpendicular magnetic fields show a rich, pseudofractal spectrum, that can be related to the butterfly of planar graphene. In double-wall CNTs, the interlayer interaction adds modulations in the spectrum that can be understood by studying the effects of intense magnetic fields onto bilayer graphene which is per se an interesting material due to its anomalous quantum Hall effect that could recently be measured in experiment.
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Prof. Dr. Gianaurelio Cuniberti
secretariat:
postal address:
Institute for Materials Science
TU Dresden
01062 Dresden, Germany
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