标题：Raman spectrum study of delta-doped GaAs/AlAs multiple-quantum wells
作者：Zheng, Wei-Min; Cong, Wei-Yan; Li, Su-Mei; Wang, Ai-Fang; Li, Bin; Huang, Hai-Bei
作者机构：[Zheng, Wei-Min; Cong, Wei-Yan; Wang, Ai-Fang] Shandong Univ Weihai, Sch Space Sci & Phys, Weihai 264209, Peoples R China.; [Li, Su-Mei] Shandong Un 更多
通讯作者：Zheng, WM;Li, B
通讯作者地址：[Zheng, WM]Shandong Univ Weihai, Sch Space Sci & Phys, Weihai 264209, Peoples R China;[Li, B]Chinese Acad Sci, Shanghai Inst Tech Phys, Shanghai 20008 更多
来源：CHINESE PHYSICS B
关键词：coupled mode; Raman spectrum; delta-doped GaAs/AlAs multiple quantum; wells
摘要：Three samples of GaAs/AlAs multiple-quantum wells with different quantum well widths and delta-doped with Be acceptors at the well center were grown on (100) GaAs substrates by molecular beam epitaxy. Polarized Raman spectra were recorded on the three samples at temperatures in a range of 4-50 K in a backscattering configuration. The two branches of coupled modes due to the interaction of the hole intersubband transitions and the quantum-well longitudinal optical (LO) phonon were observed clearly. The evaluation formalism of the Green function was employed and each lineshape of the Raman spectrum of the coupled modes was simulated. The dependence of the peak position of Raman shifts of the two coupled modes as well as the quantum-well LO phonon on the quantum-well size and measured temperature were given, and the coupling interaction mechanism between the hole subband transitions and the quantum-well LO phonon was researched.