TITLE

Room-temperature resonant tunneling of electrons in carbon nanotube junction quantum wells

AUTHOR(S)
Biswas, Sujit K.; Schowalter, Leo J.; Yung Joon Jung; Vijayaraghavan, Aravind; Ajayan, Pulickel M.; Vajtai, Robert
PUB. DATE
May 2005
SOURCE
Applied Physics Letters;5/2/2005, Vol. 86 Issue 18, p183101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Resonant tunneling structures [M. Bockrath, W. Liang, D. Bozovic, J. H. Hafner, C. B. Lieber, M. Tinkham, and H. Park, Science 291, 283 (2001)], formed between the junction of two single walled nanotubes and the conductive atomic force microscopy tip contact were investigated using current sensing atomic force microscopy. Oscillations in the current voltage characteristics were measured at several positions of the investigated nanotube. The oscillatory behavior is shown to follow a simple quantum mechanical model, dependent on the energy separation in the quantum well formed within the two junctions. Our model shows that these observations seen over several hundreds of nanometers, are possible only if the scattering cross section at defects is small resulting in long phase coherence length, and if the effective mass of the carrier electrons is small. We have calculated the approximate mass of the conduction electrons to be 0.003 me.
ACCESSION #
17164721

 

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