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...[ Read more ]

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.