Peierls structural transition in organic crystals of the TTT2I3 type in a 2D approximation

Abstract

The metal-insulator transition of the Peierls type is studied in organic crystals of tetrathiotetracene iodide with the lowest carrier concentration value in a 2D approximation. The two most important electron-phonon interaction mechanisms-of the deformation potential type and the polaron type-are considered. The dynamical interaction of carriers with defects is also taken into account. The renormalized phonon spectrum is calculated; it is shown that the transition is of the Peierls type.