Imaging the symmetry breaking of molecular orbitals in single-wall carbon nanotubes

H. Lin, J. Lagoute, V. Repain, C. Chacon, Y. Girard, F. Ducastelle, H. Amara, A. Loiseau, P. Hermet, L. Henrard, S. Rousset

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Résumé

Carbon nanotubes have attracted considerable interest for their unique electronic properties. They are fascinating candidates for fundamental studies of one dimensional materials as well as for future molecular electronics applications. The molecular orbitals of nanotubes are of particular importance as they govern the transport properties and the chemical reactivity of the system. Here, we show for the first time a complete experimental investigation of molecular orbitals of single wall carbon nanotubes using atomically resolved scanning tunneling spectroscopy. Local conductance measurements show spectacular carbon-carbon bond asymmetry at the Van Hove singularities for both semiconducting and metallic tubes, demonstrating the symmetry breaking of molecular orbitals in nanotubes. Whatever the tube, only two types of complementary orbitals are alternatively observed. An analytical tight-binding model describing the interference patterns of π orbitals confirmed by ab initio calculations, perfectly reproduces the experimental results.
langue originaleAnglais
journalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Numéro de publication23
Les DOIs
Etat de la publicationPublié - 8 juin 2010

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    Lin, H., Lagoute, J., Repain, V., Chacon, C., Girard, Y., Ducastelle, F., Amara, H., Loiseau, A., Hermet, P., Henrard, L., & Rousset, S. (2010). Imaging the symmetry breaking of molecular orbitals in single-wall carbon nanotubes. Physical Review B - Condensed Matter and Materials Physics, 81(23). https://doi.org/10.1103/PhysRevB.81.235412