The GW approximation (GWA) extends the well-known Hartree-Fock approximation (HFA)
for the self-energy (exchange potential), by replacing the bare Coulomb potential v by the …

How can the fundamental band gap of an insulator be predicted? As a difference of ground‐
state energies, the fundamental gap seems to fall within the reach of density functional …

Excitonic mechanisms of defect formation and of sputtering from surfaces, induced as a
consequence of exciton relaxation, are effective in a limited class of wide-gap materials …

The nonrelativistic augmented-plane-wave (APW) method has been applied to calculate the
electronic band structures for several cubic perovskite-type compounds, including KNi F 3 …

Electric field modulated absorption spectra of vapor deposited layers of tetracene and
pentacene indicate existence of charge transfer transitions. In tetracene the transitions from …

This book is based on the results of many years of experimental work by the author and his
colleagues, dealing with the electronic properties of organic crystals. E. Silinsh has played a …

Numerical calculations of the optical-absorption coefficient for direct, excitonic transitions in
a uniform applied electric field are presented. The electron-hole scattering is treated within …

Experimental work on the electron energy-band structures of the alkali halides is reviewed in
order to obtain a set of basic parameters (band gap E g, threshold energy E t, and electron …

Much of small polaron theory is based on highly idealized models, often essentially a
continuum description with a single vibrational frequency. These models ignore much of the …

Motivated by recent developments concerning coloration and energy storage in lithium
intercalated nanostructural TiO 2, quantum chemical Hartree-Fock calculations have been …