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- W2068705188 abstract "The electronic charge density of a free electron gas is exactly calculated up to second order in the perturbing potential, using a direct density matrix approach. The effect of the second order correction is analysed for both f.c.c.-lattice metals and zincblende semiconductors and it is found, that the singularity of the quadratic filter function, introduced in this work, leads to the appearance of a covalent bonding charge in semiconductors. For illustration of the method, the charge distribution of Ge is calculated and compared with results of explicit summation of the wave functions. Es wird die Elektronendichte eines mit einem gitterperiodischen Potential gestörten freien Elektronengases in quadratischer Näherung bezäglich des Potentials berechnet. Die Größe des quadratischen Gliedes von Metallen in k.f.z.-Struktur wird mit der von Halbleitern in Zinkblendestruktur verglichen und dabei festgestellt, daß die Bindungsladung bei Halbleitern eine Folge der Singularität der in dieser Arbeit eingeführten Filterfunktion 2. Ordnung ist. Als Beispiel wird die Valenzelektronendichte für Ge angegeben." @default.
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- W2068705188 date "1976-10-01" @default.
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- W2068705188 title "The quadratic response of a Fermi gas: Electronic charge density of valence electrons in zincblende semiconductors" @default.
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- W2068705188 doi "https://doi.org/10.1002/pssb.2220770218" @default.
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