Doping- and size-dependent suppression of tunneling in carbon nanotubes

Abstract

We study the effect of doping in the suppression of tunneling observed in multi-walled nanotubes, incorporating as well the influence of the finite dimensions of the system. A scaling approach allows us to encompass the different values of the critical exponent $\alpha$ measured for the tunneling density of states in carbon nanotubes. We predict that further reduction of $\alpha$ should be observed in multi-walled nanotubes with a sizeable amount of doping. In the case of nanotubes with a very large radius, we find a pronounced crossover between a high-energy regime with persistent quasiparticles and a low-energy regime with the properties of a one-dimensional conductor.

arXiv comment4 pages, 2 figures, LaTeX file, pacs: 71.10.Pm, 71.20.Tx, 72.80.Rj

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• Electronic screening and correlated superconductivity in carbon nanotubes
• Transport through a double barrier for interacting quasi one-dimensional electrons in a Quantum Wire in the presence of a transverse magnetic field
• Magnetic field effects and renormalization of the long-range Coulomb interaction in Carbon Nanotubes
• Modulation of Luttinger liquid exponents in multi-walled carbon nanotubes
• Influence of dimensionality on superconductivity in carbon nanotubes