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# KKRsusc program: Theory
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This page should give you a brief introduction to the theoretical background of the KKRsusc program. To find more details on the theory and a detailed description on the method follow these links:
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... | ... | @@ -32,7 +33,7 @@ Using a new basis set <span dir="">\\ket{\\phi\_{ilb}}</span>, where <span dir=" |
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```math
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\begin{equation}
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G^{proj}_{iLb,jL^'b^'}(E) = \int_{0}^{r_{MT}}drr^{2}\int_{0}^{r_{MT}}dr^{'}r^{'2} Y_{L}(\hat{r})\phi_{ilb}(r)G_{iL;jL^{'}}(r,r^{'};E)Y_{L^{'}}(\hat{r}^{'})\phi_{jl^{'}b^{'}}(r^{'})
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G^{proj}_{iLb, jL'b'}(E) = \int_{0}^{r_{MT}}drr^{2}\int_{0}^{r_{MT}}dr'r^{2}' Y_{L}(\hat{r})\phi_{ilb}(r)G_{iL;jL'}(r,r';E)Y_{L^{'}}(\hat{r}')\phi_{jl'b'}(r')
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\end{equation}
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```
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The basis function used for the projection is constructed as
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