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 2024-01-21T19:38:26Z 2024-01-21T19:38:26Z 2022-01-10 1996-04 0921-4526 https://pubs.kist.re.kr/handle/201004/144491 Spatial and dynamical properties of optical phonons in AlxGa1-xAs alloys and CaAs/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. English ELSEVIER SCIENCE BV ALLOYS MODEL Spatial and dynamical properties of optical phonons in AlxGa1-xAs and GaAs/AlxGa1-xAs superlattices: Beyond the mean field approach Article 10.1016/0921-4526(95)00853-5 1 PHYSICA B-CONDENSED MATTER, v.219-20, pp.684 - 686 PHYSICA B-CONDENSED MATTER 219-20 684 686 scie scopus A1996UL19600223 2-s2.0-13544266611 Physics, Condensed Matter Physics Article; Proceedings Paper ALLOYS MODEL mean-field approximations