title: Photoluminescence of tetrahedral quantum-dot quantum wells.
abstract: Taking into account the tetrahedral shape of a quantum-dot quantum well (QDQW) when describing excitonic states, phonon modes, and the exciton-phonon interaction in the structure, we obtain within a nonadiabatic approach a quantitative interpretation of the photoluminescence spectrum of a single CdS/HgS/CdS QDQW. We find that the exciton ground state in a tetrahedral QDQW is bright, in contrast to the dark ground state for a spherical QDQW. The position of the phonon peaks in the photoluminescence spectrum is attributed to interface optical phonons. We also show that the experimental value of the Huang-Rhys parameter can be obtained only within the nonadiabatic theory of phonon-assisted transitions.
authors.affiliation: Laboratory of Physics of Multilayer Structures, Department of Theoretical Physics, State University of Moldova, A. Mateevici 60, MD-2009 Chişinău, Moldova.
authors.forename: Vladimir A
authors.initials: VA
authors.lastname: Fonoberov
authors.forename: Evghenii P
authors.initials: EP
authors.lastname: Pokatilov
authors.forename: Vladimir M
authors.initials: VM
authors.lastname: Fomin
authors.forename: Jozef T
authors.initials: JT
authors.lastname: Devreese