Lassagne, Benjamin and Raquet, Bertrand and Broto, Jean-Marc and Triozon, François and Roche, Stephan and Flahaut, Emmanuel and Ondarçuhu, Thierry and Vieu, Christophe and Gonzalez, Jesus Unconventional magnetotransport phenomena in individual carbon nanotubes. (2006) In: 12th International Conference on Narrow Gap Semiconductors (NGS 12), 3- 7 Juil 2005, Toulouse, France .
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We investigate the quantum transport in different individual carbon nanotubes in the light of magneto-transport experiments in intense (60T pulsed)magnetic field. Large magnetic fields are required to probe field dependent gap modulation and quantum interference effects along the circumference of the tube. Such experiments along with a control of the electrostatic doping of the tube by a back-gate voltage constitute an unique tool to explore the exceptional electronic properties of this material. We bring evidence that the field dependence of the conductivity is a fingerprint of the electronic conduction modes and their interplay with the band structure (helicity), the static disorder and the location of the Fermi level of the tube. We infer the characteristic lengths of the electronic transport (the electronic mean free path and the phase coherence length) which are differently modified by the Fermi level location, depending on the disorder.
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