INFLUENCE OF THE PARAMETER OF THE ELECTRON-PHONON INTERACTION ON THE ENERGY SPECTRUM OF POLARONS IN QUASI-TWO-DIMENSIONAL STRUCTURES

We present the results of studies of the energy spectrum of polarons in quasi-two-dimensional heterosystems with a variable parameter of the electron-phonon interaction (0 < alpha < 3) depending on the wave vector. The calculations were performed by using perturbation theory and the variational method of Lee-Low- Pines (LLP). The specific calculations were carried out for the heterostructures GaAs/AlAs, CdSe/glass, and CuCl/glass, for which the weak and intermediate electron-phonon couplings are realized: alpha = 0 : 0 7 1, alpha = 0 : 0 4 6 1, and alpha = 2 : 0 9 1, respectively. In the frames of the LLP method, the wave function of a polaron is determined. We evaluated the mean number of virtual phonons surrounding an electron, calculated the binding energy of a polaron and its effective mass as a function of the wave vector, and performed the comparative analysis of structures with different electron-phonon couplings.