Comparison of Optical and Piezoelectric Phonon Scattering Mechanisms in a Two-Dimensional Electron System
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概要
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Using the optical conductivity formula obtained in the linear response scheme, we compare intraband transition linewidths due to optical and piezoelectric phonon scatterings for the electron systems in quantum square wells. We find for ZnO that the piezoelectric phonon scattering is more sensitive to the electron density (or screening effect) than the optical one, the linewidth increases with the temperature for both cases, and the well width dependence of the linewidth varies in very complicated manner with the electron density. We also find that the piezoelectric (longitudinal optical) phonon scattering is dominant at densities smaller (larger) than the critical value which is characterized by the temperature and the well-width of the system.
- 2009-09-25
著者
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Kang Nam
Faculty Of Nanoscience And Nanotechnology Pusan National University
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Choi Sang
Department Of Agricultural Chemistry Gyeongsang National University
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Kang Nam
Faculty of Nanoscience and Nanotechnology, Pusan National University, Miryang 627-706, Republic of Korea
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Hwang Sungu
Faculty of Nanoscience and Nanotechnology, Pusan National University, Miryang 627-706, Republic of Korea
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