Abstract
We have first calculated the driving force of ω phase transformation (PT) based on the electron-phonon interaction Hamiltonian. The nucleation rate of PT has also been investigated in the interaction system. The condensation of one single phonon makes a great contribution to the formation of charge density wave (CDW) whose amplitude is related to the wavevector of phonon. Considering the electron-phonon interaction and the condensation of phonon, Double Sine-Gordon equation of atomic phase angle has been proposed to study the nonlinear characteristics of ω PT and the electron-phonon coupling mechanism is suggested as the main mechanism of nucleation.
