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TitleDipolar vibrational modes in spherical semiconductor quantum dots
Author(s)Vasilevskiy, Mikhail
Quantum dots
Lattice dynamics
Dielectric function
FIR spectroscopy
Issue date2002
PublisherAmerican Physical Society
JournalPhysical Review B (Condensed Matter)
Citation"Physical Review B (Condensed Matter)". ISSN 0163-1829. 66 (2002) 195326:1-195326:9
Abstract(s)Spatially quantized dipolar phonon modes in a spherical quantum dot ~QD! made of a polar isotropic material are considered in the framework of a continnum model. Different mechanical boundary conditions are analyzed, which are shown to strongly influence the spectrum of the dipole-active modes. The phonon-related polarizability of a single QD and an average dielectric function of a composite containing QDs are calculated. Numerical results are presented for CdSe and InP dots. A strongly dipole-active gap mode is predicted for InP QDs embedded in a matrix with a defined range of dielectric constant. The effect of increasing QD concentration in ensembles is discussed in terms of the dipole–dipole interaction between the dots, which can result in their bulk-like FIR absorption spectra with a peak at the transverse optical ~TO! phonon frequency instead of the Fro¨hlich frequency. It is suggested that similar effects might occur in individual microcrystals, which can explain their absorbtion of FIR radiation at the TO phonon frequency, despite having a size much smaller than the radiation wavelength.
AccessOpen access
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)
CDF - FMNC - Artigos/Papers (with refereeing)

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