Key points are not available for this paper at this time.
The mean-value-point technique for Brillouin-zone averages is shown to be applicable to the calculation of electronic dielectric screening matrices. The dielectric-matrix elements for which the technique is not accurate are only a few and for them a separate simple prescription is given. Detailed results are presented for the =0, q=0, and q0 matrices of diamond, Si, Ge, -Sn, MgO, and NaCl. Comparison with a nearly-free-electron model is also discussed.
Baldereschi et al. (Thu,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: