Static Polarizabilities of Nanoclusters

ORAL

Abstract

In the present work, we evaluate the static polarizability of a cluster using a microscopic method that is exact within the linear and dipolar approximations. Numerical examples are presented for various shapes and sizes of clusters composed of identical atoms, where the term ``atom'' actually refers to a generic constituent, which could be any polarizable entity. The results for the clusters' polarizabilities are compared with those obtained by assuming simple additivity of the constituents' atomic polarizabilities; in many cases, the difference is large, demonstrating the inadequacy of the additivity approximation. Comparison is made (for symmetrical geometries) with results obtained from continuum models of the polarizability. Also, the surface effects due to the nonuniform local field near a surface or edge are shown to be significant.

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Authors

  • Hye-Young Kim

  • Jorge Sofo

    • Physics Department, The Pennsylvania State University, University Park, PA
    • Department of Physics, The Pennsylvania State University

  • Darrell Velegol

    • Chemical Engineering Department, The Pennsylvania State University, University Park, PA

  • Milton Cole

    • Penn State University
    • Physics Department, The Pennsylvania State University, University Park, PA

  • Gautam Mukhopadhyay

    • Physics Department, Indian Institute of Technology-Bombay, India