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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