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- W2074450008 startingPage "A1531" @default.
- W2074450008 abstract "Perturbation theory can be applied to calculate the density of states of an electron moving in a random potential produced by impurity centers, but for small concentrations the usual approximations are unreliable and do not predict correctly the shape of the impurity band. A new chain of approximations is obtained by expressing the Green's function of the electron in terms of a self-propagator. It is shown that this method leads to more realistic results." @default.
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- W2074450008 date "1965-08-30" @default.
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- W2074450008 title "Impurity Bands and Perturbation Theory" @default.
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- W2074450008 doi "https://doi.org/10.1103/physrev.139.a1531" @default.
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