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The Korringa–Kohn–Rostoker approximation or KKR method〔 〕〔 〕〔 〕 is used to calculate the electronic band structure of solids. It is a Green's function method which matches the different types of one-electron wave functions and their derivatives which are used in a muffin-tin approximation. ==Introduction== In solid state physics the properties of electrons and potentials are determined by the spherical symmetry of the interior of the atoms and the point group symmetry of the crystal lattice. The wave function of an electron and the potential in the KKR method are both composed of two parts. A linear combination of spherical harmonics, which is multiplied by a radial wave function, is used for the wave function on the inside of the atoms where the potential is the potential of the atom. Linear combinations of plane waves are used for the wave function in the regions between the atoms where the potential is constant. 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「Korringa–Kohn–Rostoker approximation」の詳細全文を読む スポンサード リンク
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