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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 Thomas–Fermi screening ： ウィキペディア英語版 Thomas–Fermi screening Thomas–Fermi screening is a theoretical approach to calculating the effects of electric field screening by electrons in a solid.〔N. W. Ashcroft and N. D. Mermin, ''Solid State Physics'' (Thomson Learning, Toronto, 1976)〕 It is a special case of the more general Lindhard theory; 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.〔 The Thomas-Fermi wavevector (in Gaussian-cgs units) is〔 :$k\_0^2\; =\; 4\backslash pi\; e^2\; \backslash frac$ where μ is the chemical potential (fermi level), ''n'' is the electron concentration and ''e'' is the elementary charge. Under many circumstances, including semiconductors that are not too heavily doped, ''n''∝''e''''μ''/''k''B''T'', where ''k''B is Boltzmann constant and ''T'' is temperature. In this case, :$k\_0^2\; =\; 4\backslash pi\; e^2\; n/(k\_BT)$ i.e. 1/k0 is given by the familiar formula for Debye length. For more details and discussion, including the one-dimensional and two-dimensional cases, see the article: Lindhard theory. ==Derivation== 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「Thomas–Fermi screening」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.