Raman spectra of GaAs-AlxGa1-xAs superlattices |
| |
| Institution: | 1. State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;2. Institute of Advanced Semiconductors & Zhejiang Provincial Key Laboratory of Power Semiconductor Materials and Devices, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 310027, China;1. Poznan University of Technology, Institute of Material Research and Quantum Engineering, ul. Piotrowo 3, 60-965, Poznań, Poland;2. Poznan University of Technology, Institute of Chemical Technology and Engineering, ul. Berdychowo 4, 60-965, Poznań, Poland;3. Poznan University of Medical Sciences, Department of Facial Malformations, ul. Bukowska 70, 60-812, Poznań, Poland;1. Center for the Innovation and Application of Science and Technology, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona # 550, Col. Lomas 2a Sección, C.P. 78210 San Luis Potosí, Mexico;2. Graduate School of Science and Engineering, Ehime University, Bunkyo-cho 3, Matsuyama, Ehime 790-8577, Japan;3. Instituto de Investigación en Comunicación Óptica, Universidad Autonóma de San Luis Potosí, Av. Karakorum 1470, Lomas 4a Secc., San Luis Potosí, SLP 78210, Mexico |
| |
| Abstract: | Systematic theoretical studies of Raman spectra of GaAs-AlxGa1-xAs superlattices are presented. The electronic states are described by an envelope-function method and the phonon modes are described in a microscopic rigid-ion model. Both resonant and nonresonant Raman scattering processes are considered. For resonant Raman scattering, the effects of discrete exciton states plus the continuum and the valence-band mixing are included via a k-space sampling method. Both the Fröhlich and deformation-potential mechanisms for electron-phonon coupling are considered. These two mechanisms are responsible for principal features in the z(x, x)z̄ and z(x, y)z̄ geometries, respectively. We find that the effects of exciton continuum states are quite important and the resonant Raman spectra so obtained are in much better agreement with experiment compared to those without including the exciton continuum states. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
