CCTN09 Symposium:
CCTN09 Symposium:
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 [5]. 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 [5].
References
[1] D. V. Kosynkin et al., Nature 458, 872 (2009).
[2] L. Jiao et al., Nature 458, 877 (2009).
[3] Y. Son, M. L. Cohen, and S. G. Louie, Phys. Rev. Lett. 97, 216803 (2006).
[4] J. Fernández-Rossier, Phys. Rev. B 77, 075430 (2008).
[5] H. Santos, L. Chico, and L. Brey, arXiv:cond-mat 0904.3676.
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