Purely 2D Polaron Model for Strong- and Weak-Coupling Surface, Interface Materials**The project supported by National Natural Science Foundation of China and Guangdong Provincial Natural Science Foundation of China

Abstract

The ground-state energy of polarons in strong- and weak-coupling surface, interface materials is investigated by a concise purely two-dimensional polaron model. Phonon correlation is introduced in phonon coherent state to represent the wavefunction of the system. A self-consistent integral nonlinear equation satisfied by the distribution function of the energy is derived. Numerical calculations for the ground-state energy and binding energy of polarons in different type materials are performed using iteration method. Results are obtained in a wide range of coupling constant and are found to be lower than those of previous calculations.