Special Condensed Matter Physics Seminar
Tuesday, March 14, 2000, 2:30 p.m.
Math Building, room 3206
Molecular Electronics: Conjugated Molecular Wires and Carbon Nanotubes
Chongwu Zhou
(Department of Chemistry, Stanford University)
Abstract: There has been major interest and a dramatic advance
in the study of electron transport in molecular systems. Two molecular
systems, conjugated molecular wires and carbon nanotubes, hold the promise
for revolutionizing nanoelectronics and nanophysics. The first part
of my talk focuses on two techniques, break junctions and nanopores, which
are employed to study conjugated molecules (~ 20 angstroms in length).
Various properties such as rectifying behavior, bond rotation induced transitions
and negative differential resistances will be presented. In the second
part I will report our systematic transport studies on carbon nanotubes
produced with a novel CVD method. We demonstrate high gain MOSFETs
with semiconducting nanotubes and present the first evidence for the existence
of semimetallic nanotubes. Our study on metallic nanotubes directly
confirms phase coherent transport along the tube via the observation of
Aharonov-Bohm oscillations. Finally a surprising electromechanical
property from metallic tubes will be presented.
Host: Ellen Williams
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