Electric Field Effect Control of Low-dimensional Transport Phenomena in Nanoscaled MaterialsPhilip Kim, Columbia University
The use of modern state-of-the-art device fabrication techniques and
the development of new methods of nanosclae material
synthesis/manipulation enable us to investigate at the mesoscopic
scales. In these length scales the nanoscaled materials have exhibited
a variety of unique physical phenomena due to the enhanced quantum
confinement of electrons in reduced dimensions. In this presentation,
we will discuss our recent investigation of mesoscopic transport
phenomena in carbon nanotubes, nanowires, and a single atomic layer
systems such as graphene, where quantum mechanically enhanced low
dimensional effects are predominant. Employing electric field effect
from the gate electrodes, we can control the carrier density in these
materials which control the transport properties. The subjects include,
(1) growth/manipulation of ultralong nanotubes and electrical
characterization of them, (2) electric field effect in mesoscopic
thermoelectric transport in nanotube/nanowires, (3) 1D to 3D cross-over
in electric transport in multichannel nanowires, and (5) electric
field-effect control of novel 2D systems obtained from layered
materials including graphene and other thin atomic layer crystals.