STM/STS characterization of the electronic structures in carbon nanotubes and their alkali metal doped complexes.

利用UHV-STM/STS技术研究了单壁碳纳米管（SWCNT）在室温和低温下的电子结构。在组装状态下的单壁碳纳米管的原子分辨STM图像显示出一些特征性的一维条纹沿着管轴，这可能表明存在增强的一维态密度沿着这些线。对束中单个单壁碳纳米管的STS测量表明，它们在束中具有几乎相似的电子结构，但在不同的束中却不同，这可能表明一种类型的单壁碳纳米管倾向于组装形成一个束。几乎所有观察到的铷掺杂的单壁碳纳米管的隧道光谱显示出金属的功能，这意味着铷掺杂不仅在移动的费米能级，但也杂化的单壁碳纳米管和金属离子的电子带。

Electronic structures of single walled carbon nanotubes (SWCNT) in an assembly state are investigated by a UHV-STM/STS technique at room and low temperatures. The atomically-resolved STM images of an SWCNT in an assembly state exhibit some characteristic one-dimensional stripes along the tube-axes, which may indicate the existence of enhanced one-dimensional density of state along these lines. STS measurements on individual SWCNTs in a bundle have revealed that they have almost the similar electronic structure in the bundle but rather different in the different bundles, which may suggest that one type of SWCNTs tends to be assembled to form one bundle. Almost all observed tunneling spectra of rubidium-doped SWCNTs show metallic features, which means that rubidium-doping results in not only the shift of the Fermi-level but also the hybridization of the electronic bands of the SWCNTs and metal ions.