POLARON GROUND-STATE IN QUANTUM-WELLS OF II-VI COMPOUNDS

Ground state properties of a polaron in II-VI quantum wells are invest igated by considering both the confined and interface phonon modes whi ch exist in such structures. The Landau-Pekar approach is employed to treat the electron-phonon interaction because these materials are gene rally much more ionic than III-V compounds. The binding energy and eff ective mass are calculated by means of a variational method as functio ns of the well width, and the three-dimensional limits in both the wel l and barrier materials are examined. Contributions from different pho non modes are studied separately and our results demonstrate the impor tance of symmetric interface modes in wells of widths similar to 100 A ngstrom or less.