XIV. Transport in Nanotubes
Quite recently, two experimental groups have reported the unzipping of carbon nanotubes into graphene nanoribbons [1,2].This abstract was created on: 2009/5/29 12:43:53 (EST).
The partial unzipping of a carbon nanotube can be considered as a seamless union of a carbon nanotube and a graphene nanoribbon. We study these carbon nanostructures, which are found to have remarkable transport properties.
We have found that graphene nanoribbons [3,4] behave at certain energy ranges as perfect valley filters for carbon nanotubes, with the maximum possible conductance . Our results show that nanotubes and the corresponding nanoribbons obtained by unzipping act as optimal contacts for each other, being completely transparent at certain energy intervals.
Application of a magnetic field couples ferromagnetically the edges of the ribbon portion, opening new channels and yielding a large magnetoresistance. Thus, a partially unzipped tube is by itself a magnetoresistive device. Our proposal opens a new route for the design of mixed graphene/nanotube devices .
 D. V. Kosynkin et al., Nature 458, 872 (2009).
 L. Jiao et al., Nature 458, 877 (2009).
 Y. Son, M. L. Cohen, and S. G. Louie, Phys. Rev. Lett. 97, 216803 (2006).
 J. Fernández-Rossier, Phys. Rev. B 77, 075430 (2008).
 H. Santos, L. Chico, and L. Brey, arXiv:cond-mat 0904.3676.
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