Confinement effects on optical phonons in polar tetrapod nanocrystals detected by resonant inelastic light scattering.
We investigated CdTe nanocrystal tetrapods of different sizes by resonant inelastic light scattering at room temperature and under cryogenic conditions. We observe a strongly resonant behavior of the phonon scattering with the excitonic structure of the tetrapods. Under resonant conditions we detect a set of phonon modes that can be understood as confined longitudinal-optical phonons, surface-optical phonons, and transverse-optical phonons in a nanowire picture.
Krahne
Roman
R
National Nanotechnology Laboratory of CNR-INFM c/o Istituto Superiore Universitario di Formazione Interdisciplinare, Università di Lecce, Via per Arnesano, 73100 Lecce, Italy. roman.krahne@unile.it
Chilla
Gerwin
G
Schüller
Christian
C
Carbone
Luigi
L
Kudera
Stefan
S
Mannarini
Gianandrea
G
Manna
Liberato
L
Heitmann
Detlef
D
Cingolani
Roberto
R