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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/53

Title: Static polarizabilities of dielectric nanoclusters
Authors: KIM, HYE-YOUNG
SOFO, JORGE O
VELEGOL, DARRELL
COLE, MILTON W
MUKHOPADHYAY, GAUTAM
Keywords: dielectric materials
nanostructured materials
mathematical models
continuum mechanics
Issue Date: 2005
Publisher: American Physical Society
Citation: Physical Review A-Molecular, and Optical Physics 72(5), 053201-208
Abstract: A cluster consisting of many atoms or molecules may be considered, in some circumstances, to be a single large molecule with a well-defined polarizability. Once the polarizability of such a cluster is known, one can evaluate certain properties—e.g. the cluster’s van der Waals interactions, using expressions derived for atoms or molecules. 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 dditivity 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.
Description: ©2005 The American Physical Society
URI: http://dx.doi.org/10.1103/PhysRevA.72.053201
http://hdl.handle.net/10054/53
http://dspace.library.iitb.ac.in/xmlui/handle/10054/53
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