| 压力下Si/Ge超晶格热电材料的声子谱和群速度 |
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| 引用本文： | 崔彦,郭子政,张院生,宣志国.压力下Si/Ge超晶格热电材料的声子谱和群速度[J].内蒙古师范大学学报(自然科学版),2009,38(2). |
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| 作者姓名： | 崔彦 郭子政 张院生 宣志国 |
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| 作者单位： | 内蒙古师范大学,物理与电子信息学院,内蒙古,呼和浩特,010022
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| 基金项目： | 国家自然科学基金，内蒙古师范大学研究生科研基金 |
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| 摘 要： | 利用面心立方模型和晶格动力学理论计算了Si/Ge超晶格材料的纵向(z)和横向(x)声学声子谱,用半解析的方法计算了声学声子传播的群速度.计算结果表明,纵向声子谱有简并的现象,横向声子谱没有简并,在布里渊区的中心和边界,纵向和横向声子的群速度几乎减小为零.引入流体静力学压力并修正应变存在时的力常数,研究了应变对超晶格材料声子谱和群速度的影响,结果表明,静压使声学声子的频率系统性上升,使声学声子的群速度明显增大.
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| 关 键 词： | 晶格动力学 声子谱 群速度 静压 应变 |
The Phonon Spectrum and Group Velocity of Si/Ge Superlattices under Hydrostatic Pressure |
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| CUI Yan,GUO Zi-zheng,ZHANG Yuan-sheng,XUAN Zhi-guo.The Phonon Spectrum and Group Velocity of Si/Ge Superlattices under Hydrostatic Pressure[J].Journal of Inner Mongolia Normal University(Natural Science Edition),2009,38(2). |
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| Authors: | CUI Yan GUO Zi-zheng ZHANG Yuan-sheng XUAN Zhi-guo |
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| Institution: | College of Physics and Electronic Information;Inner Mongolia Normal University;Hohhot 010022;China |
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| Abstract: | The vertical(z) and transversal(x) dispersion relations and group velocities of the Si/Ge superlattices were calculated by the lattice dynamical theory.We found that the dispersion relations are degenerated in the vertical direction but not in the transversal direction.We also found that the vertical and transversal group velocities almost decrease to zero in the Brillouin zone center and boundaries.We studied the effects of the hydrostatic pressure on the phonon spectrum and group velocity of the superlatt... |
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| Keywords: | lattice dynamics phonon spectrum group velocity hydrostatic pressure strain |
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