Regensburg 2007 – wissenschaftliches Programm

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PV: Plenarvorträge

PV I

PV I: Plenarvortrag

Montag, 26. März 2007, 08:30–09:15, H1

Understanding Nanostructures: Nanotubes, Nanowires, and Graphene Nanoribbons — •Steven G. Louie — Department of Physics, University of California at Berkeley — Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

The restricted geometry and symmetry of nanostructures often give rise to novel properties that are also potentially useful in applications. In this presentation, 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, Si nanowires, and graphene nanoribbons. These nanostructures exhibit a number of unexpected behaviors -- novel conductance characteristics, extraordinarily large excitonic effects, strange friction forces, and a field-induced half-metallic state for the zigzag graphene nanoribbons, among others. The physical mechanisms behind these unusual behaviors are examined.