Excitons and Polarons in Quantum Wells
  We study properties of polarons and excitons confined to a potential generated in a planar semiconductor heterostructure of the $Ga_{1-x}Al_{x}As/GaAs/Ga_{1-x}Al_{x}As$ type. In contrast with results of other authors peaks are found for the exciton energy and the polaron effective mass as functions of the potential width while the polaron energy reveals rather monotonous behavior. 
B. Gerlach (Univ. Dortmund) and M. A. Smondyrev (JINR, Dubna)