Abstract Submitted to the    NANOTUBE'06 Conference:

Electrical Transport in Molecules, Nanotubes and Graphene

Philip Kim

Columbia University

pk2015@columbia.edu

XVII. Transport in Complex Nanostructures

In this presentation, I will start with reporting our recent progress of synthesizing extremely long length scale individual single walled nanotubes (SWNTs) and multiwalled nanotubes (MWNTs). Employing microscopic mechanical manipulations, we demonstrated fabricating complex structure device fabrications [1]. In addition, electrical transport measurements in long SWNTs allow us to probe the 1-dimensional resistivity and mean-free path of these materials at wide temperature ranges.

In the second part, we will discuss the transport in nanotubes-single molecule hybrid system. We have developed a method to construct such a system, in which cut single walled carbon nanotubes are covalently attached to molecular wires through an amide linkage. Using this versatile method we have tested a number of different types of molecules, including species with chemical functionality that allows the molecular conductance to be switched [2].

Finally, I will discuss the unusual transport phenomena discovered in single atomic sheet of graphene [3]. Recent advances in micromechanical extraction and fabrication techniques for graphite structures now permit graphene to be probed experimentally. In this part, I will report an experimental investigation of magneto transport in a high mobility single layer of graphene. Adjusting the chemical potential using the electric field effect, we observe an unusual half integer quantum Hall effect for both electron and hole carriers in graphene.

[1] B. H. Hong et al., Proc. Nat. Acad. Soc. 102, 14155-14158 (2005).
[2] X. Guo, et al., Science 311, 356- 359 (2006).
[3] Y. Zhang, Y. Tan, H. L. Stormer, and P. Kim, Nature 438, 201-204 (2005).

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