Min, Kyoung-In Rho, Heesuk Song, Jing Dong Choi, Won Jun Lee, Yong Tak 2024-01-20T16:04:30Z 2024-01-20T16:04:30Z 2021-09-05 2011-10 0374-4884 https://pubs.kist.re.kr/handle/201004/129934 Optical phonons in InGaAlAs digital alloy structures are systematically studied in terms of (In0.53Ga0.47As)(l)/(In0.52Al0.48As)(l) (period length l = 1, 2, 4, 5) and (In0.53Ga0.47As)(1-z)/(In0.52Al0.48As)(z) (composition z = 0.2, 0.4, 0.6, 0.8) short-period superlattices. Raman spectra reveal GaAs-like and AlAs-like longitudinal optical (LO) phonons confined in In0.53Ga0.47As and In0.52Al0.48As layers, respectively. In As-like LO phonons are also observed in the In0.53Ga0.47As and the In0.52Al0.48As layers. The confined GaAs-like LO phonon frequency is sensitive to the In0.53Ga0.47As layer thickness and shifts downward by similar to 7 cm(-1) with decreasing layer thickness, showing excellent agreement with the LO phonon dispersion for bulk GaAs. Importantly, the confined Al As-like LO phonon frequency is not sensitive to the In0.52Al0.48As layer thickness, indicating the presence of high-quality interface boundaries between the In0.53Ga0.47As and the In0.52Al0.48As layers. English KOREAN PHYSICAL SOC OPTICAL-PROPERTIES CONFINED LO PHONONS SUPERLATTICES SCATTERING DEPENDENCE SPECTRA Raman Studies of InGaAlAs Digital Alloys Article 10.3938/jkps.59.2801 1 JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.59, no.4, pp.2801 - 2805 JOURNAL OF THE KOREAN PHYSICAL SOCIETY 59 4 2801 2805 scie scopus kci ART001596120 000295915500028 2-s2.0-80054955423 Physics, Multidisciplinary Physics Article OPTICAL-PROPERTIES CONFINED LO PHONONS SUPERLATTICES SCATTERING DEPENDENCE SPECTRA Raman scattering Digital alloy Superlattice