Physics – Condensed Matter – Materials Science
Scientific paper
1999-06-28
Phys. Rev. B 61, 7722 (2000).
Physics
Condensed Matter
Materials Science
Revtex, 24 pages including 11 figures. Submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.61.7722
The present work reports a general method for the calculation of t he polarizability of a truncated sphere on a substrate. A multipole ex pansion is used, where the multipoles are not necessarily localized in the center of the sphere but can freely move on the revolution axis. From the weak formulation of the boundary conditions, an infinite set of linear equations for the multipole coefficients is derived. To obta in this set, the interaction between the island and the substrate is t aken into account by the technique of image multipoles. For numerical implementation, this set is truncated at an arbitrary mu ltipole order. The accuracy of the method is jugded through the stabil ity of the truncated sphere polarizability and the the fulfilment of t he boundary conditions which are demonstrated to be satisfied in large regions of the parameter space. This method brings an improvement wit h respect to the Bedeaux's case \cite{Wind87a,Wind87b} where the multi poles are located in the center of the sphere.
Jupille Jacques
Lazzari Remi
Roux Stephane
Simonsen Ingve
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