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政大機構典藏 > 理學院 > 應用物理研究所 > 期刊論文 > Item 140.119/70149

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Title:	The Surface Dielectric Function and Its Sum Rule for a Semi-Infinite Electrou System
Authors:	楊志開 Cheng,Yi-Chen;Huang,Hsin-Yi;Yang,Chih-Kai
Contributors:	應物所
Date:	1995
Issue Date:	2014-09-25 11:49:59 (UTC+8)
Abstract:	In this paper we define a surface dielectric function for a semi-infinite electron system and a sum rule involving the imaginary part of the inverse of the surface dielectric function is derived. The sum rule has almost exactly the same form as the well-known dielectric function f-sum rule in a bulk system, with the bulk quantities replaced by the corresponding surface quantities. However there is an important difference that the surface sum rule applies to all surfaces only in the Q - 0 limit, where Q is the two-dimensional wavevector parallel to the surface. For small Q, linear and higher order terms of Q will appear in the sum rule whose coefficients may depend on the surface properties of the system considered. This is due to the fact that for Q = 0 both the surface dielectric function and the surface plasma frequency depend on the average electron density only, independent of the surface properties; however for Q # 0; the Q-dependence of the above two quantities both depend sensitively on the surface properties of the system considered.
Relation:	Chinese Journal of Physics,33(2),169-180
Data Type:	article
Appears in Collections:	[應用物理研究所 ] 期刊論文

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