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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Lindhard theory ： ウィキペディア英語版 Lindhard theory Lindhard theory〔J. Lindhard, K. Dan. Vidensk. Selsk. Mat. Fys. Medd. 28, 8 (1954)〕〔N. W. Ashcroft and N. D. Mermin, ''Solid State Physics'' (Thomson Learning, Toronto, 1976)〕 is a method of calculating the effects of electric field screening by electrons in a solid. It is based on quantum mechanics (first-order perturbation theory) and the random phase approximation. Thomas–Fermi screening can be derived as a special case of the more general Lindhard formula. In particular, Thomas–Fermi screening is the limit of the Lindhard formula when the wavevector (the reciprocal of the length-scale of interest) is much smaller than the fermi wavevector, i.e. the long-distance limit.〔 This article uses cgs-Gaussian units. == Formula == Lindhard formula for the longitudinal dielectric function is given by ::}. |} Here, $V\_q$ is $V\_(q)\; -\; V\_(q)$ and $f\_k$ is the carrier distribution function which is the Fermi–Dirac distribution function (see also Fermi–Dirac statistics) for electrons in thermodynamic equilibrium. However this Lindhard formula is valid also for nonequilibrium distribution functions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lindhard theory」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.