Influence of Electronic Polarization on the Optical Properties of Insulators

摘要: The Toyozawa theory of the electronic polaron and related Haken-Schottky optical dielectric function are applied to alkali silver halides rare-gas solids. It is found that for most these crystals above dynamical theories reduce a static limit. This in turn indicates calculations polarization effects based on classical approach Mott Littleton will be valid. Such carried out this paper. self-energies due interaction "bare" electrons or holes with field may as large several eV. Furthermore, because "inertialess" nature polarization, other must taken into account calculation states which excited optically. Thus, example, band gap certain much 5 eV smaller than "good" one-electron band-structure would yield. available experimental data values gaps critically reviewed comparisons made results calculations. computed $r$ dependence small-radius excitations (e.g., $n=1$ excitons many substances) should not influence excitation energy an important way; electron hole particles when same unit cell. fact consistent success number has been neglected. shown how binding energies can arise from conduction valence-band hole. use effective-mass method computing briefly discussed.