Studies of charge transport in carbon nanotube multiloops
We use scanning SQUID measurements to study the charge transport in single wall carbon nanotube multi-loop coils, that may serve as building blocks for future nanoelectronic devices. A highly desirable geometry for such applications is a coil. The carbon nanotube coils are highly conductive, as expected for defect-free carbon nanotubes, but adjacent nanotube segments in the coil are more highly coupled than in regular bundles of single-wall carbon nanotubes, owing to their perfect crystal momentum matching, which enables tunneling between the turns. We use scanning SQUID to record the change in magnetic ﬂux as a function of position near the nanotube device. By mapping the magnetic fields generated by the current flow we can reconstruct where the current flows and deduce the current path along the carbon nanotube multi-loop.
In collaboration with: Ernesto Joselevich