The in_4Se_3 crystal as a three-dimensional imitative model of phenomena in one-dimensional crystals

摘要

For three-dimensional charge carriers described by the dispersion law with quartic terms of the wave vector, the density of states function similar as in the one-dimensional case was determined. This similarity allows the Pekar and Dejgen condenson states in the continuum approximation to exist. The calculated phonon spectrum reveals reveals optical vibrations of a very low Frequency, which favours the electron-phonon interaction and creation of The condenson states.