THE PROPERTIES OF SURFACE POLARON IN THE SEMIINFINITE POLAR CRYSTAL

The effective Hamiltonian and the renormalized mass of surface polaron , where the electron is strongly coupled with the surface optical (SO) phonons but weakly or intermediately coupled with the bulk longitudin al-optical (LO) phonons, were first reviewed. The self-energy and the renormalized mass of the polaron for the polar crystals of potassium i odide, silver chloride and silver bromide are evaluated as a function of the depth from the crystal surface. Results of our calculation indi cate that the effect of the electron-SO phonon interaction is dominant only within a very small layer from the crystal surface. Its justific ation awaits further experimental results.