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Physics at the Nanoscale: Tubes, Sheets, Ribbons, and Junctions
Professor Steven G. Louie
Department of Physics
Materials Sciences Division
Lawrence Berkeley National Laboratory
University of California at Berkeley
Berkeley, Ca
Abstract
The restricted geometry of nanostructures often gives rise to novel, unexpected properties and phenomena. In particular, symmetry and many-electron effects can become significantly more important in determining the behaviors of these systems. In this talk, I discuss some recent progress on using theory and computation to understand and predict some of their electronic, transport, optical, and mechanical properties. Examples of systems of interest include carbon and BN nanotubes, graphene, graphene nanoribbons, and molecular junctions. These nanostructures exhibit a number of unexpected behaviors – novel conductance characteristics, extraordinarily large excitonic effects (even in the metallic systems), interesting friction forces, anomalous anisotropy in the dynamics of carriers (the 2D massless Dirac fermions) in graphene under an external periodic potential, and an electric field-induced half-metallic state for the zigzag graphene nanoribbons, among others. The physical mechanisms behind these unusual behaviors are examined.
URL
http://civet.berkeley.edu/louie/
Time and Location
Thursday, April 17, 2008, 12:45 p.m.
OHE 122
Refreshments served after the seminar in HED Lobby
The Scientific Community is Cordially Invited.
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