title: Direct observation of confined acoustic phonons in the photoluminescence spectra of a single CdSe-CdS-ZnS core-shell-shell nanocrystal.
abstract: We report on the direct observation of confined acoustic phonons in the photoluminescence spectra of single CdSe-CdS-ZnS nanocrystals, whose ligands were exchanged to poly(ethylene oxide) (PEO) before they were embedded in a PEO matrix. Modeling a nanocrystal as an elastic sphere, the confined acoustic modes can be assigned to purely radial vibrations: the breathing mode and its two first radial harmonics. In addition to acoustic modes, we also observe longitudinal optical modes of the core material and, remarkably, also of both shell materials.
authors: Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany.
authors: Gerwin
authors: G
authors: Chilla
authors: Tobias
authors: T
authors: Kipp
authors: Torben
authors: T
authors: Menke
authors: Detlef
authors: D
authors: Heitmann
authors: Marija
authors: M
authors: Nikolic
authors: Andreas
authors: A
authors: Frömsdorf
authors: Andreas
authors: A
authors: Kornowski
authors: Stephan
authors: S
authors: Förster
authors: Horst
authors: H
authors: Weller