Publication
Title
Raman scattering in quantum disks: enhanced efficiency of the electron-phonon interaction due to non-adiabaticity
Author
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.
Language
English
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.
Publication
Pennington : Electrochemical Society, 2001
ISBN
1-56677-352-0
Volume/pages
2001:19, p. 307-320
ISI
000180622500029
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 01.03.2012
Last edited 20.07.2017
To cite this reference