Dependence of Peierls transition on carrier concentration in organic crystals of TTT2I3 in the 3D approximation

Abstract

The dependence of the Peierls structural transition on carrier concentration in quasi-onedimensional (Q1D) organic crystals of TTT2I3 is studied in the 3D approximation. A more complete physical model that considers simultaneously two most important electron-phonon interactions is used. The first interaction is similar to that of deformation potential, while the second one is of the polaron type. The dynamical interaction of carriers with defects is also taken into account. An analytic expression for the phonon Green function is obtained in the random phase approximation. A renormalized phonon spectrum is determined for different values of dimensionless Fermi momentum kF. In all cases, the Peierls critical temperature is determined.