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APPLIED PHYSICS LETTERS VOLUME 83, NUMBER 8 25 AUGUST 2003COMMENTSComment on ‘‘Intrinsic electron transport properties of carbon nanotubeY- junctions’’ †Appl. Phys. Lett. 81, 5234 „2002…‡a)Antonis N. AndriotisInstitute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, P.O. Box 1527,71110 Heraklio, Crete, Greeceb)Deepak SrivastavaNASA Ames Research Center, CSC, Mail Stop T27-A1, Moffett Field, California 94035-1000c)Madhu MenonDepartment of Physics and Astronomy and Center for Computational Sciences, University of Kentucky,Lexington, Kentucky 40506-0055~Received 7 March 2003; accepted 13 June 2003!@DOI: 10.1063/1.1604948#Carbon nanotubes have received much attention recently rectification effect is entirely due to metallic contacts andfor molecular electronic device applications due to their abil- that three-terminal geometry is not necessary for rectifica-ity to form both metallic and semiconducting type nanotubes tion. This is based on their calculation and comparison of a1,2in experiments. Two- and three-terminal junctions of dif- threefold symmetric ~10,0! SWCN Y junction ~with andferent type of nanotubes were first proposed in without metallic electrodes! case with a straight ~10,0! car-3–10 11–19simulations and later fabricated in experiments. The bon nanotube ~with and without metallic electrodes!. Trans-importance of three terminal T- and Y- junction nanotubes mission functions and local densities of states ~LDOS! ...