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

机译：成像单壁碳纳米管中分子轨道的对称破坏

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摘要

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 v orbitals confirmed by ab initio calculations, perfectly reproduces the experimental results.
机译：碳纳米管以其独特的电子性能吸引了相当大的兴趣。它们是一维材料基础研究以及未来分子电子应用的引人入胜的候选人。纳米管的分子轨道特别重要，因为它们控制着系统的传输性能和化学反应性。在这里，我们首次展示了使用原子分辨扫描隧道光谱技术对单壁碳纳米管分子轨道进行的完整实验研究。局部电导测量结果显示，半导体和金属管在Van Hove奇异点处均具有惊人的碳-碳键不对称性，这表明纳米管中分子轨道的对称性破裂。无论管是什么，都只能观察到两种互补的轨道。一个描述性的紧密结合模型，描述了从头算得到的v轨道的干涉图案，完美再现了实验结果。

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  • 来源
    《Physical review》 |2010年第23期|P.235412.1-235412.6|共6页
  • 作者

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

  • 作者单位

    Laboratoire Materiaux et Phenomenes Quantiques, Universite Paris Diderot-CNRS, UMR 7162, 10 rue Alice Domon et Leonie Duquet, 75205 Paris Cedex 13, France Laboratoire d'Etude des Microstructures, ONERA-CNRS, BP 72, 92322 Chatillbn, France;

    rnLaboratoire Materiaux et Phenomenes Quantiques, Universite Paris Diderot-CNRS, UMR 7162, 10 rue Alice Domon et Leonie Duquet, 75205 Paris Cedex 13, France;

    rnLaboratoire Materiaux et Phenomenes Quantiques, Universite Paris Diderot-CNRS, UMR 7162, 10 rue Alice Domon et Leonie Duquet, 75205 Paris Cedex 13, France;

    rnLaboratoire Materiaux et Phenomenes Quantiques, Universite Paris Diderot-CNRS, UMR 7162, 10 rue Alice Domon et Leonie Duquet, 75205 Paris Cedex 13, France;

    rnLaboratoire Materiaux et Phenomenes Quantiques, Universite Paris Diderot-CNRS, UMR 7162, 10 rue Alice Domon et Leonie Duquet, 75205 Paris Cedex 13, France;

    rnLaboratoire d'Etude des Microstructures, ONERA-CNRS, BP 72, 92322 Chatillbn, France;

    rnLaboratoire d'Etude des Microstructures, ONERA-CNRS, BP 72, 92322 Chatillbn, France;

    rnLaboratoire d'Etude des Microstructures, ONERA-CNRS, BP 72, 92322 Chatillbn, France;

    rnResearch Centre in Physics of Matter and Radiation (PMR), University of Namur (FUNDP), Rue de Bruxelles 61, 5000 Namur, Belgium;

    rnResearch Centre in Physics of Matter and Radiation (PMR), University of Namur (FUNDP), Rue de Bruxelles 61, 5000 Namur, Belgium;

    rnLaboratoire Materiaux et Phenomenes Quantiques, Universite Paris Diderot-CNRS, UMR 7162, 10 rue Alice Domon et Leonie Duquet, 75205 Paris Cedex 13, France;

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  • 正文语种 eng
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  • 关键词

    single particle states; scanning tunneling microscopy (including chemistry induced with STM);

    机译：单粒子态扫描隧道显微镜（包括用STM诱导的化学反应）;

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