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arXiv 0911.4437cond-mat.mtrl-sci
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碳纳米管分子轨道对称破缺的成像

Imaging the symmetry breaking of molecular orbitals in carbon nanotubes

Hong Lin, Jérôme Lagoute, Vincent Repain, Cyril Chacon, Yann Girard, François Ducastelle, Hakim Amara, Annick Loiseau, Patrick Hermet, Luc Henrard, Sylvie Rousset

摘要:

碳纳米管由于其独特的电子性质而引起了人们的极大兴趣。它们是一维材料的基础研究以及未来分子电子学应用的迷人候选者。纳米管的分子轨道是特别重要的,因为它们支配系统的传输特性和化学反应性。在这里,我们首次展示了一个完整的单壁碳纳米管分子轨道的原子分辨扫描隧道光谱实验研究。局部电导测量显示壮观的碳-碳键的不对称性在范霍夫奇异的半导体和金属管,展示了对称性破缺的分子轨道在纳米管。无论管,只有两种类型的互补轨道交替观察。一个分析紧束缚模型描述的干扰模式?从头计算证实的轨道,完美地再现了实验结果。

英文摘要:

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 ? orbitals confirmed by ab initio calculations, perfectly reproduces the experimental results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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