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Title: Effects of core size and shell thickness on phonon modes in GaAs/AlAs shell quantum dots

Abstract

Phonon modes in spherical GaAs quantum dots (QDs) embedded in spherical AlAs shells with up to 11855 atoms (about 8.0 nm in diameter) are calculated by using a valence force field model. All the vibration frequencies and vibration amplitudes of these shell QDs are calculated directly from the lattice dynamic matrix by employing the projection operators of the irreducible representations of the group theory. The effects of the size of GaAs cores and the thickness of AlAs shells on the phonon modes are investigated. The quantum confinement effects of both the vibration frequencies and vibration strengths are investigated. The microscopic interface modes, which can only be revealed by the microscopic model, are identified and discussed. {copyright} 2001 American Institute of Physics.

Authors:
;
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40203715
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 89; Journal Issue: 11; Other Information: DOI: 10.1063/1.1368392; Othernumber: JAPIAU000089000011006037000001; 057111JAP; PBD: 1 Jun 2001; Journal ID: ISSN 0021-8979
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; ATOMS; CONFINEMENT; GROUP THEORY; IRREDUCIBLE REPRESENTATIONS; PHONONS; PHYSICS; PROJECTION OPERATORS; THICKNESS; VALENCE

Citation Formats

Qin, G, and Ren, Shang-Fen. Effects of core size and shell thickness on phonon modes in GaAs/AlAs shell quantum dots. United States: N. p., 2001. Web. doi:10.1063/1.1368392.
Qin, G, & Ren, Shang-Fen. Effects of core size and shell thickness on phonon modes in GaAs/AlAs shell quantum dots. United States. doi:10.1063/1.1368392.
Qin, G, and Ren, Shang-Fen. Fri . "Effects of core size and shell thickness on phonon modes in GaAs/AlAs shell quantum dots". United States. doi:10.1063/1.1368392.
@article{osti_40203715,
title = {Effects of core size and shell thickness on phonon modes in GaAs/AlAs shell quantum dots},
author = {Qin, G and Ren, Shang-Fen},
abstractNote = {Phonon modes in spherical GaAs quantum dots (QDs) embedded in spherical AlAs shells with up to 11855 atoms (about 8.0 nm in diameter) are calculated by using a valence force field model. All the vibration frequencies and vibration amplitudes of these shell QDs are calculated directly from the lattice dynamic matrix by employing the projection operators of the irreducible representations of the group theory. The effects of the size of GaAs cores and the thickness of AlAs shells on the phonon modes are investigated. The quantum confinement effects of both the vibration frequencies and vibration strengths are investigated. The microscopic interface modes, which can only be revealed by the microscopic model, are identified and discussed. {copyright} 2001 American Institute of Physics.},
doi = {10.1063/1.1368392},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 11,
volume = 89,
place = {United States},
year = {2001},
month = {6}
}