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

Research output: Contribution to journalArticle

Abstract

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.
Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number23
DOIs
Publication statusPublished - 8 Jun 2010

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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

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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. / Imaging the symmetry breaking of molecular orbitals in single-wall carbon nanotubes. In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 81, No. 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.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 23, 08.06.2010.

Research output: Contribution to journalArticle

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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.

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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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