Confinement Effects on Optical Phonons in Polar Tetrapod Nanocrystals Detected by Resonant Inelastic Light Scattering
journal contributionposted on 08.03.2006, 00:00 by Roman Krahne, Gerwin Chilla, Christian Schüller, Luigi Carbone, Stefan Kudera, Gianandrea Mannarini, Liberato Manna, Detlef Heitmann, Roberto Cingolani
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.