Spatial and dynamical properties of optical phonons in AlxGa1-xAs and GaAs/AlxGa1-xAs superlattices: Beyond the mean field approach

D. S. Kim; P. H. Song; S. H. Jhi; Y. S. Lim; E. J. Shin; Y. H. Yee; J. S. Khim; J. Ihm; J. H. Lee; J. S. Chang; D. H. Woo; K. N. Kang; D. Kim; J. J. Song

doi:10.1016/0921-4526(95)00853-5

Spatial and dynamical properties of optical phonons in Al_xGa_1-xAs and GaAs/Al_xGa_1-xAs superlattices: Beyond the mean field approach

D. S. Kim, P. H. Song, S. H. Jhi, Y. S. Lim, E. J. Shin, Y. H. Yee, J. S. Khim, J. Ihm, J. H. Lee, J. S. Chang, D. H. Woo, K. N. Kang, D. Kim, J. J. Song

School of Electrical and Computer Engineering

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Abstract

Spatial and dynamical properties of optical phonons in Al_xGa_1-xAs alloys and GaAs/Al_xGa_1-xAs quantum wells are studied. An isotopically disordered harmonic crystal model is developed to study spatial properties of optical phonons in Al_xGa_1-xAs alloys. In the GaAs/Al_xGa_1-xAs system, transmission of the GaAs optical phonons through an Al_xGa_1-xAs barrier is studied using three-dimensional lattice dynamical model, fully accounting for the random arrangement of Ga and Al atoms in the alloy barrier. In the Al_xGa_1-xAs alloy, a localized-to-extended transition is found as a function of x. In GaAs/Al_xGa_1-xAs quantum wells, the transmission coefficient of the GaAs LO phonons through the alloy barrier remains significant below x < 0.3. These results are in good qualitative agreement with the experimentally deduced coherence length of LO phonons from nonequilibrium hot phonon populations.

Original language	English
Pages (from-to)	684-686
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	219-220
Issue number	1-4
DOIs	https://doi.org/10.1016/0921-4526(95)00853-5
State	Published - 1 Apr 1996

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Kim, D. S., Song, P. H., Jhi, S. H., Lim, Y. S., Shin, E. J., Yee, Y. H., Khim, J. S., Ihm, J., Lee, J. H., Chang, J. S., Woo, D. H., Kang, K. N., Kim, D., & Song, J. J. (1996). Spatial and dynamical properties of optical phonons in Al_xGa_1-xAs and GaAs/Al_xGa_1-xAs superlattices: Beyond the mean field approach. Physica B: Condensed Matter, 219-220(1-4), 684-686. https://doi.org/10.1016/0921-4526(95)00853-5

@article{017db2c125d64b32ac7ab16bc4703b04,

title = "Spatial and dynamical properties of optical phonons in AlxGa1-xAs and GaAs/AlxGa1-xAs superlattices: Beyond the mean field approach",

abstract = "Spatial and dynamical properties of optical phonons in AlxGa1-xAs alloys and GaAs/AlxGa1-xAs quantum wells are studied. An isotopically disordered harmonic crystal model is developed to study spatial properties of optical phonons in AlxGa1-xAs alloys. In the GaAs/AlxGa1-xAs system, transmission of the GaAs optical phonons through an AlxGa1-xAs barrier is studied using three-dimensional lattice dynamical model, fully accounting for the random arrangement of Ga and Al atoms in the alloy barrier. In the AlxGa1-xAs alloy, a localized-to-extended transition is found as a function of x. In GaAs/AlxGa1-xAs quantum wells, the transmission coefficient of the GaAs LO phonons through the alloy barrier remains significant below x < 0.3. These results are in good qualitative agreement with the experimentally deduced coherence length of LO phonons from nonequilibrium hot phonon populations.",

author = "Kim, {D. S.} and Song, {P. H.} and Jhi, {S. H.} and Lim, {Y. S.} and Shin, {E. J.} and Yee, {Y. H.} and Khim, {J. S.} and J. Ihm and Lee, {J. H.} and Chang, {J. S.} and Woo, {D. H.} and Kang, {K. N.} and D. Kim and Song, {J. J.}",

year = "1996",

month = apr,

day = "1",

doi = "10.1016/0921-4526(95)00853-5",

language = "English",

volume = "219-220",

pages = "684--686",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier B.V.",

number = "1-4",

}

Kim, DS, Song, PH, Jhi, SH, Lim, YS, Shin, EJ, Yee, YH, Khim, JS, Ihm, J, Lee, JH, Chang, JS, Woo, DH, Kang, KN, Kim, D & Song, JJ 1996, 'Spatial and dynamical properties of optical phonons in Al_xGa_1-xAs and GaAs/Al_xGa_1-xAs superlattices: Beyond the mean field approach', Physica B: Condensed Matter, vol. 219-220, no. 1-4, pp. 684-686. https://doi.org/10.1016/0921-4526(95)00853-5

TY - JOUR

T1 - Spatial and dynamical properties of optical phonons in AlxGa1-xAs and GaAs/AlxGa1-xAs superlattices

T2 - Beyond the mean field approach

AU - Kim, D. S.

AU - Song, P. H.

AU - Jhi, S. H.

AU - Lim, Y. S.

AU - Shin, E. J.

AU - Yee, Y. H.

AU - Khim, J. S.

AU - Ihm, J.

AU - Lee, J. H.

AU - Chang, J. S.

AU - Woo, D. H.

AU - Kang, K. N.

AU - Kim, D.

AU - Song, J. J.

PY - 1996/4/1

Y1 - 1996/4/1

N2 - Spatial and dynamical properties of optical phonons in AlxGa1-xAs alloys and GaAs/AlxGa1-xAs quantum wells are studied. An isotopically disordered harmonic crystal model is developed to study spatial properties of optical phonons in AlxGa1-xAs alloys. In the GaAs/AlxGa1-xAs system, transmission of the GaAs optical phonons through an AlxGa1-xAs barrier is studied using three-dimensional lattice dynamical model, fully accounting for the random arrangement of Ga and Al atoms in the alloy barrier. In the AlxGa1-xAs alloy, a localized-to-extended transition is found as a function of x. In GaAs/AlxGa1-xAs quantum wells, the transmission coefficient of the GaAs LO phonons through the alloy barrier remains significant below x < 0.3. These results are in good qualitative agreement with the experimentally deduced coherence length of LO phonons from nonequilibrium hot phonon populations.

AB - Spatial and dynamical properties of optical phonons in AlxGa1-xAs alloys and GaAs/AlxGa1-xAs quantum wells are studied. An isotopically disordered harmonic crystal model is developed to study spatial properties of optical phonons in AlxGa1-xAs alloys. In the GaAs/AlxGa1-xAs system, transmission of the GaAs optical phonons through an AlxGa1-xAs barrier is studied using three-dimensional lattice dynamical model, fully accounting for the random arrangement of Ga and Al atoms in the alloy barrier. In the AlxGa1-xAs alloy, a localized-to-extended transition is found as a function of x. In GaAs/AlxGa1-xAs quantum wells, the transmission coefficient of the GaAs LO phonons through the alloy barrier remains significant below x < 0.3. These results are in good qualitative agreement with the experimentally deduced coherence length of LO phonons from nonequilibrium hot phonon populations.

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U2 - 10.1016/0921-4526(95)00853-5

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SN - 0921-4526

VL - 219-220

SP - 684

EP - 686

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 1-4

ER -

Spatial and dynamical properties of optical phonons in Al_xGa_1-xAs and GaAs/Al_xGa_1-xAs superlattices: Beyond the mean field approach

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