The Korringa Kohn Rostoker (KKR) band structure method~(1,2), when compared with other band structure methods, has the advantage of dealing with small matrices due to the fast convergence of scattering operators in angular momentum space. A further advantage is that of dealing with Green's functions. This is particularly valuable in the case of random metallic alloys, where it allows to carry out with relative ease the ensemble configuration averages, necessary in order to evaluate spectral properties. These are performed by various techniques, among which the Coherent, Portential Approximation~3 (CPA) has been one of the most successful and reliable approaches~4. Moreover the algorithm is intrinsically parallel~5 allowing very efficient calculations.
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