A model charge density cancels multipoles to accelerate Ewald summations in periodic systems, with faster convergence shown for the GaAs fundamental gap.
Hobson, The Theory of Spherical and Ellipsoidal Harmonics, Cambridge University Press (1931)
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Model density approach to Ewald summations
A model charge density cancels multipoles to accelerate Ewald summations in periodic systems, with faster convergence shown for the GaAs fundamental gap.