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Screening effect : ウィキペディア英語版
Screening effect
In solids, especially in metals and semiconductors, the electrostatic screening or screening effect reduces the electrostatic field and Coulomb potential of an ion inside the solid. Like the electric field of the nucleus is reduced inside an atom or ion due to the shielding effect, the electric fields of ions in conducting solids are further reduced by the cloud of conduction electrons. The screened Coulomb potential is expressed as〔

:V(r) = \frac \exp(phonon dispersion relation in metals. The screened potential is used to calculate the electronic band structure of a large variety of materials, often in combination with pseudopotential models.
==See also==

*Nearly free electron model
*Muffin-tin approximation

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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