Screening of longitudinal optical phonons by carriers in quantum dots

Screening of the macroscopic electric field associated with longitudinal optical (LO) phonons by carriers in polar semiconductor nanocrystals is studied both theoretically and experimentally. A shift in the LO-phonon energy induced by electronic transitions from the ground state to the excited state...

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Bibliographic Details
Published in:Solid state communications 1995-07, Vol.95 (4), p.227-231
Main Authors: Tamulaitis, G, Rodrigues, P.A.M, Yu, Peter Y
Format: Article
Language:English
Subjects:
A. nanostructures
A. semiconductors
Condensed matter: electronic structure, electrical, magnetic, and optical properties
D. electron-phonon interaction
D. phonons
E. inelastic light scattering
Exact sciences and technology
Iii-v and ii-vi semiconductors
Infrared and raman spectra and scattering
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
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Summary:Screening of the macroscopic electric field associated with longitudinal optical (LO) phonons by carriers in polar semiconductor nanocrystals is studied both theoretically and experimentally. A shift in the LO-phonon energy induced by electronic transitions from the ground state to the excited states of an electron confined in a nanocrystal is predicted. This result is in agreement with experimental resonant Raman spectra of CdS XSe 1−X-doped glass excited by intense picosecond dye laser pulses.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(95)00251-0