Electron transport in very clean, as-grown suspended carbon nanotubes
Electron transport in very clean, as-grown suspended carbon nanotubes
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DOI：
10.1038/nmat1478
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发表时间：
2005-10-01
期刊：
影响因子：
41.2
通讯作者：
Dai, H
中科院分区：
文献类型：
--
作者：
Cao, J;Wang, Q;Dai, H
迄今为止，单壁碳纳米管已经显示出丰富的量子输运现象（1-11）。无缺陷、无扰动的单壁碳纳米管与良好的或可调的金属接触对于探测纳米管的本征电学性质是重要的。由于许多无序和随机因素，在实验上满足这些条件是不平凡的。在这里，我们表明，类似于1 μ m长的完全悬浮的单壁碳纳米管生长在金属接触之间的地方提供了设备，在更广泛的能量范围内比钉在基板上的纳米管定义良好的特性。观察到了真金属、小禁带和大禁带半导体纳米管中的各种低温输运机制，包括磁性中的量子态填充、分裂和交叉。由于Aharonov-Bohm效应。清洁输运数据显示了接触结电阻与单壁碳纳米管器件中各种输运状态之间的相关性。此外，我们表明，电输运数据可以用来探测纳米管的能带结构，包括非线性能带色散。
Single- walled carbon nanotubes have shown a wealth of quantum transport phenomena thus far(1-11). Defect- free, unperturbed single- walled carbon nanotubes with well behaved or tunable metal contacts are important for probing the intrinsic electrical properties of nanotubes. Meeting these conditions experimentally is non- trivial owing to numerous disorder and randomizing factors. Here we show that similar to 1-mu m- long fully suspended single- walled carbon nanotubes grown in place between metal contacts afford devices with well defined characteristics over much wider energy ranges than nanotubes pinned on substrates. Various low- temperature transport regimes in true- metallic, small- and large- bandgap semiconducting nanotubes are observed, including quantum states shell-filling, - splitting and - crossing in magnetic. fields owing to the Aharonov - Bohm effect. The clean transport data show a correlation between the contact junction resistance and the various transport regimes in single- walled- carbon- nanotube devices. Furthermore, we show that electrical transport data can be used to probe the band structures of nanotubes, including nonlinear band dispersion.