THESIS
2014
xiii, 135 pages : illustrations (some color) ; 30 cm
Abstract
The focus of this thesis is on the magnetotransport effects in carbon nanostructures, in
particular, on the arrays of carbon nanotubes and graphene. In the case of carbon nanotubes,
the basis of the magnetotransport lies in the transverse Josephson coupling between the
nanotubes, since otherwise there should be no magnetic effect in 1D systems. In 1D
superconductivity, the coupled nanotubes can display finite resistance owing to the
phenomenon of phase slips. The effect of magnetic field is shown to lead to oscillatory
behavior in the resistance as a function of the magnetic field. In the case of graphene, while
there have been extensive investigation of magnetotransport effects, the situation at the charge
neutrality point (CNP) of graphene has always remained out of reach sinc...[
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The focus of this thesis is on the magnetotransport effects in carbon nanostructures, in
particular, on the arrays of carbon nanotubes and graphene. In the case of carbon nanotubes,
the basis of the magnetotransport lies in the transverse Josephson coupling between the
nanotubes, since otherwise there should be no magnetic effect in 1D systems. In 1D
superconductivity, the coupled nanotubes can display finite resistance owing to the
phenomenon of phase slips. The effect of magnetic field is shown to lead to oscillatory
behavior in the resistance as a function of the magnetic field. In the case of graphene, while
there have been extensive investigation of magnetotransport effects, the situation at the charge
neutrality point (CNP) of graphene has always remained out of reach since the equal number of
oppositely charged carriers has implied a null Hall effect. We propose to use top and bottom
gating to realize the Hall Effect at the CNP.
Besides the above, this thesis also reports the extensive works that I have done in
double-walled carbon nanotubes (DWCNTs) as well as on the gating effect on the 4-Angstrom
carbon nanotube arrays. These and others will be detailed for the record.
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