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Theses

Multi-Terminal Electron Transport
in Single-Wall Carbon Nanotubes

Abstract : This thesis is devoted to the experimental study of multi-terminal electronic transport properties of single-wall carbon nanotubes. This implies to find new methods to measure reliably the intrinsic resistance of the nanotube, and to probe the one-dimensional nature of the electron behavior in it.
Because the access to the intrinsic resistance of a nanotube is limited by bad contacts in the two-terminal measurement, a new four-terminal measurement technique using multi-wall carbon nanotubes as non-invasive voltage probes has been devel-
oped. In the linear regime, at room temperature, four-terminal measurements show that the single-wall nanotube is a classical resistor that obeys Ohm's law. At very low temperature, negative four-terminal resistances due to quantum interference effects
are observed, as predicted by Laudauer-Buttiker formula.
At intermediate temperature, the one-dimensional nature of the electron behavior in single-wall carbon nanotube is described by Luttinger Liquid theory. However, previous electron tunneling measurements could not provide enough information to
exclude other theoretical explanations, e.g. the dynamical environmental Coulomb Blockade theory. Following the proposition of theoreticians, crossed metallic single- wall nanotube structures have been fabricated. We observe a zero-bias anomaly in
one tube which is suppressed by a current flowing through the other nanotube. These
results are compared with a Luttinger-liquid model which takes into account electrostatic tube-tube coupling together with crossing-induced backscattering processes.
Explicit solution of a simplified model is able to describe qualitatively the observed experimental data with only one adjustable parameter.
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Submitted on : Tuesday, October 17, 2006 - 3:14:48 PM
Last modification on : Thursday, December 10, 2020 - 12:39:02 PM
Long-term archiving on: : Thursday, September 20, 2012 - 12:01:03 PM

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  • HAL Id : tel-00107144, version 1

Citation

Bo Gao. Multi-Terminal Electron Transport
in Single-Wall Carbon Nanotubes. Condensed Matter [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2006. English. ⟨tel-00107144⟩

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