Title
Raman scattering in quantum disks: enhanced efficiency of the electron-phonon interaction due to non-adiabaticity Raman scattering in quantum disks: enhanced efficiency of the electron-phonon interaction due to non-adiabaticity
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
conferenceObject
Publication
Pennington :Electrochemical Society ,
Subject
Physics
Chemistry
Engineering sciences. Technology
Source (journal)
Quantum Confinement VI : nanostructured materials and devices
Source (book)
6th International on Quantum Confinement - Nanostructured Materials and, Devices, SEP 05-06, 2001, San Francisco, Calif.
Volume/pages
2001() :19 , p. 307-320
ISBN
1-56677-352-0
ISI
000180622500029
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
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.
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