Research on the Relationship between Density of States and Conducting Properties of Single-walled Carbon Nanotubes

材料科学技术（英文）, 2003, 19(2): 110-112.

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1.Department of Information and Calculating Science, Changsha Communications University, Changsha 410076,China;Department of Applied Physics, Hunan University, Changsha 410082, China

2.Department of Applied Physics, Hunan University, Changsha 410082, China

3.Department of Applied Physics, Hunan University, Changsha 410082, China

4.Department of Applied Physics, Hunan University, Changsha 410082, China

基金项目: the Scientific Research Fund of Hunan Provincial Education Department(01C248) the National Natural Science Foundation of China(59972031)

Research on the Relationship between Density of States and Conducting Properties of Single-walled Carbon Nanotubes

Keywords： Single-walled carbon nanotubes

The analytical expression of the electronic density of states (DOS) for single-walled carbon nanotubes (SWNTs) has been derived on the basis of graphene approximation of the energy E(k) near the Fermi level EF. The distinctive properties of the DOS, the normalized differential conductivity and the current vs bias for SWNTs are deduced and analyzed theoretically.The singularities in the DOS (or in the normalized differential conductivity) predict that the jump structure of current (or conductance)-bias of SWNTs exists. All conclusions from the theoretical analysis are in well agreement with the experimental results of SWNT's electronic structure and electronic transport. In other words, the simple theoretical model in this paper can be applied to understand a range of spectroscopic and other measurement data related to the DOS of SWNTs.

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Research on the Relationship between Density of States and Conducting Properties of Single-walled Carbon Nanotubes

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