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https://ah.lib.nccu.edu.tw/handle/140.119/70149
題名: | The Surface Dielectric Function and Its Sum Rule for a Semi-Infinite Electrou System | 作者: | 楊志開 Cheng,Yi-Chen;Huang,Hsin-Yi;Yang,Chih-Kai |
貢獻者: | 應物所 | 日期: | 1995 | 上傳時間: | 25-Sep-2014 | 摘要: | 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. | 關聯: | Chinese Journal of Physics,33(2),169-180 | 資料類型: | article |
Appears in Collections: | 期刊論文 |
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169-180.pdf | 477.45 kB | Adobe PDF2 | View/Open |
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