EFFECTIVE-PHONON APPROXIMATION OF POLARONS IN TERNARY MIXED-CRYSTALS

An effective-phonon-mode approximation (EPMA) for the polaron problem in a ternary mixed crystal A(x)B(1-x)C of semiconductors is suggested. The electron-phonon coupling constants, self-trapping energies and ef fective masses of a polaron in the system are calculated. It is found that the approximation is useful for III-V and II-VI compound mixed cr ystals, but a more complicated method is necessary for I-VII compounds . The effects of the unit-cell volume varying with the composition x o f ternary mixed crystals are also investigated but proved unimportant. Copyright (C) 1996 Published by Elsevier Science Ltd