EFFECT OF STRONG ELECTRON-PHONON INTERACTIONS ON AN INTERFACE POLARON

The present work deals with an electron interacting strongly with both bulk longitudinal optical (LO) phonons and interface (IF) optical pho nons in which we adopt and generalize the Tokuda's variational method for studying the interface polaron properties in polar crystals at zer o temperature. In our approach, we can reduce the Hamiltonian equation of the system to a pair of integro-differential equations in two vari ational parameters of the. electron wavefunction from which we can cal culate various physical properties of an interface polaron including t he ground state energy, average numbers of interacting phonons, the av erage distance from the interface and the anisotropic effective masses of the interface polaron. Numerical results are obtained explicitly f or LiF crystal interfaced with NaF crystal as well as other similar sy stems with varying physical constants, which show the typical trends o f variations for the effects of strong electron-phonon interactions on different physical properties of an interface polaron.