Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-11-15
Proc. of the 2001 ECS/ISE Meeting, September 2-7, 2001, San Francisco, California (The Electrochemical Society, Inc., 2001), p
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
15 pages, 4 figures, E-mail addresses: devreese@uia.ua.ac.be, fomin@uia.ua.ac.be, leburton@ceg.uiuc.edu
Scientific paper
We treat resonant Raman scattering via the multiphonon exciton transitions in cylindrical quantum dots with a parabolic confinement in the lateral direction and with a finite rectangular interface-barrier confinement in the axial direction. The optical phonons and the electron-phonon interaction are considered within the multimode dielectric model. The model exploits both electrostatic and mechanical boundary conditions for the relative ionic displacement vector, as well as the phonon spatial dispersion in bulk. The confined phonon modes in a quantum dot are hybrids of bulk-like and interface vibrations. Raman spectra, calculated using the multimode dielectric model, compare well with experimental data. Multiphonon Raman amplitudes are calculated taking into account the effects of non-adiabaticity, which play a crucial role in the optical spectra of quantum dots. Peak intensities of Raman spectra are investigated as a function of the confinement frequency parameter and of the height of a quantum dot. Non-adiabatic transitions are shown to strongly increase the scattering probabilities and the relative multiphonon scattering intensities with respect to the one-phonon intensity.
Devreese J. T.
Fomin V. M.
Klimin Sergei N.
Leburton Jean-Pierre
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