SCREENING OF THE ELECTRON-PHONON INTERACTION IN QUASI-ONE-DIMENSIONALSEMICONDUCTOR STRUCTURES

The screening of the electron-phonon interaction due to a quasi-one-di mensional (Q1D) electron gas is investigated. The contribution of the electron-phonon interaction to the ground-state energy of the Q1D pola ron gas in different semiconductor quantum-well-wire structures is cal culated within the Hartree-Fock and the random-phase approximation. Th e influences of the width of the quantum-well wire and the electron de nsity on the ground-state energy of the polaron gas are studied. We fo und that the screening due to the electron gas reduces the effective e lectron-phonon coupling in a Q1D system appreciably and the contributi on of the electron-phonon interaction to the ground-state energy of th e polaron gas decreases with increasing electron density.