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Shape Dependence of the Scattering Processes of Optical Phonons in Colloidal Nanocrystals Detected by Raman Spectroscopy

Krahne, Roman ; Chilla, Gerwin ; Schüller, Christian ; Kudera, Stefan ; Tari, Davide ; De Giorgi, Milena ; Heitmann, Detlef ; Cingolani, Roberto ; Manna, Liberato


We investigated by Raman spectroscopy optical phonon excitations in colloidal CdTe nanocrystals of different shapes. The phonon spectra at excitation energies slightly below the absorption onset showed a strong dependence on the nanocrystal shape. For spherical nanocrystals, we detected broad longitudinal-optical phonon-scattering peaks that were blue shifted from the longitudinal-optical phonon ...


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