INTRAWELL AND INTERWELL TRANSFER OF EXCITONS IN GROWTH-INTERRUPTED QUANTUM-WELLS

Intrawell and interwell transfers of excitons are observed by a temper ature-dependent continuous-wave photoluminescence study of growth-inte rrupted single quantum wells. The intrawell transfer among the interfa ce localization areas suggests a thermodynamic equilibrium between ene rgy relaxation via LO-phonon emission and thermal population via phono n absorption. Thermal population is dominant in wider wells while rela xation is clearly observable in a four-monolayer narrow well at low te mperatures. Interwell transfer of excitons also occurs between two nar row wells. (C) 1998 Academic Press.