… Because electrons are fermions, each energy level is filled with two electrons of different spins according to the Fermi distribution, starting from the lowest energy level. At absolute zero, all the electrons in the crystal are accommodated in levels below the Fermi level ( E F ), and the levels above are empty. One energy band can accommodate twice the number of electrons , N , the number of unit cells in the crystal, but a completely filled energy band (filled band, also called a valence band) cannot carry electric current. … *Some of the terminology that refers to "filled band" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 電子はフェルミ粒子であるから,フェルミ分布に従って低いエネルギーから各準位にスピンの異なる2個ずつの電子が満たされていくが,絶対0度では,フェルミ準位(EF)より低い準位に結晶中の全電子が収容され,それより高い準位は空になっている。一つのエネルギー帯には結晶の単位胞の数Nの2倍の電子が収容されるが,完全に満たされたエネルギー帯(充満帯filled band。価電子帯valence bandともいう)は電流を流すことはできない。… ※「filled band」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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