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Static polarizabilities of dielectric nanoclusters

DSpace at IIT Bombay

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Title Static polarizabilities of dielectric nanoclusters
 
Creator KIM, HYE-YOUNG
SOFO, JORGE O
VELEGOL, DARRELL
COLE, MILTON W
MUKHOPADHYAY, GAUTAM
 
Subject dielectric materials
nanostructured materials
mathematical models
continuum mechanics
 
Description 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.
©2005 The American Physical Society
 
Publisher American Physical Society
 
Date 2007-11-23T09:13:02Z
2011-11-25T12:49:19Z
2011-12-26T13:08:42Z
2011-12-27T05:34:00Z
2007-11-23T09:13:02Z
2011-11-25T12:49:19Z
2011-12-26T13:08:42Z
2011-12-27T05:34:00Z
2005
 
Type Article
 
Identifier Physical Review A-Molecular, and Optical Physics 72(5), 053201-208
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
 
Language en_US