| 在位势对于一维双原子链晶格振动长声学波的影响 |
| |
| 引用本文： | 潘学琴,刘炳灿,田强.在位势对于一维双原子链晶格振动长声学波的影响[J].大学物理,2009,28(5). |
| |
| 作者姓名： | 潘学琴 刘炳灿 田强 |
| |
| 作者单位： | 1. 装甲兵工程学院,基础部,北京,100072
2. 北京师范大学,物理系,北京,100875 |
| |
| 基金项目： | 教育部国家理科基地创建名牌课程项目，北京市精品课程(固体物理学)建设资助项目 |
| |
| 摘 要： | 根据声学模的定义,明确了具有在位势的一维双原子链的晶格振动不存在声学模,讨论了具有在位势的一维双原子链晶格振动的低频支长波模振动图像,得到原胞中两种原子运动的振幅不再一致,低频支长波模不再是原胞质心的运动,且两种原子运动的振幅比随在位势的增大而单调增大.
|
| 关 键 词： | 在位势 一维双原子链 晶格振动图像 |
The oscillation of a diatomic chain with on-site potential |
| |
| PAN Xue-qin,LIU Bing-can,TIAN Qiang.The oscillation of a diatomic chain with on-site potential[J].College Physics,2009,28(5). |
| |
| Authors: | PAN Xue-qin LIU Bing-can TIAN Qiang |
| |
| Institution: | 1.Department of Fundamental Courses;AAFe;Beijing 100072;China;2.Department of Physics;Beijing Normal University;Beijing 100875;China |
| |
| Abstract: | The dispersion relation of a diatomic chain has two branches.For a diatomic chain with on-site potential,both these modes are optical ones,because there is also a natural gap for small wave numbers in the lower branch of dispersion relation.In the case of long wavelength "acoustic" modes,the amplitudes of the two atoms within each cell are not identical. The long wavelength "acoustic" modes are not the motions of the center of mass. |
| |
| Keywords: | on-site potential diatomic chain oscillation image |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
