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TitleConfined optical vibrations in CdTe quantum dots and clusters
Author(s)Rolo, Anabela G.
Vasilevskiy, Mikhail
Gaponik, Nikolai
Talapin, Dmitrii
Rogach, Andrey
Gomes, M. J. M.
Quantum dot
Lattice dynamics
FIR spectroscopy
Raman spectroscopy
Issue date2002
PublisherJohn Wiley and Sons
JournalPhysica Status Solidi B
Citation"Physica status solidi. B. : basic research ". ISSN 0370-1972 . 229:1 (2002) 433-437.
Abstract(s)Absorption of far-infrared (FIR) radiation and Raman scattering in CdTe nano-crystals (spherical quantum dots (QDs) of several nanometers in size) and Cd54Te32(SCH2CH2OH)8- 32 clusters prepared by colloidal synthesis were studied. Raman spectra of both QDs and clusters are dominated by a peak situated slightly below the bulk CdTe LO phonon frequency. Experimental FIR transmittance spectra of films containing CdTe clusters show a broad band between the bulk TO and LO phonon frequencies, while there is only a single dip at the Fro¨ hlich frequency observed for larger QDs. These observations are in agreement with the results of our numerical lattice dynamics calculations and previously published theoretical results based on a continuous model. It is suggested that the lattice dynamics of very small clusters is similar to that of large crystallites in the sense that there still exists the dispersion of optical vibration frequencies within the LO–TO band of bulk material.
AccessOpen access
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)
CDF - FMNC - Artigos/Papers (with refereeing)

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