Abstract
Bloch sums constructed of $s$-, $p$-, and $d$-symmetry localized orbitals are used as basis sets for describing the pseudo-wave functions and energy bands of Si, Ge, and GaAs. For a simple four-state-per-atom $s\ensuremath{-}p$ basis set of Slater orbitals, accurate valence and conduction bands are obtained by adjusting the exponential decay constant of the orbitals. With a ten-state-per-atom basis, accurate charge densities and energy bands are calculated using a variational approach.
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