Korringa–Kohn–Rostoker method
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The Korringa–Kohn–Rostoker (KKR) method is used to calculate the electronic band structure of periodic solids. In the derivation of the method using multiple scattering theory by Jan Korringa[1] and the derivation based on the Kohn and Rostoker variational method,[2] the muffin-tin approximation was used.[3] Later calculations are done with full potentials having no shape restrictions.[4] [5]