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

Résultats de recherche: Contribution à un journal/une revueArticle

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
étatPublié - 8 juin 2010

Empreinte digitale

Carbon Nanotubes
Molecular orbitals
Carbon nanotubes
broken symmetry
molecular orbitals
carbon nanotubes
Imaging techniques
Nanotubes
nanotubes
Carbon
tubes
Molecular electronics
orbitals
Chemical reactivity
molecular electronics
carbon
trucks
Electronic properties
Transport properties
reactivity

Citer ceci

Lin, H. ; Lagoute, J. ; Repain, V. ; Chacon, C. ; Girard, Y. ; Ducastelle, F. ; Amara, H. ; Loiseau, A. ; Hermet, P. ; Henrard, L. ; Rousset, S. / Imaging the symmetry breaking of molecular orbitals in single-wall carbon nanotubes. Dans: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol 81, Numéro 23.
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Imaging the symmetry breaking of molecular orbitals in single-wall carbon nanotubes. / Lin, H.; Lagoute, J.; Repain, V.; Chacon, C.; Girard, Y.; Ducastelle, F.; Amara, H.; Loiseau, A.; Hermet, P.; Henrard, L.; Rousset, S.

Dans: Physical Review B - Condensed Matter and Materials Physics, Vol 81, Numéro 23, 08.06.2010.

Résultats de recherche: Contribution à un journal/une revueArticle

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T1 - Imaging the symmetry breaking of molecular orbitals in single-wall carbon nanotubes

AU - Lin, H.

AU - Lagoute, J.

AU - Repain, V.

AU - Chacon, C.

AU - Girard, Y.

AU - Ducastelle, F.

AU - Amara, H.

AU - Loiseau, A.

AU - Hermet, P.

AU - Henrard, L.

AU - Rousset, S.

PY - 2010/6/8

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AB - 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.

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