李粮生,,
张景,
殷红成
电磁散射重点实验室 ??北京 ??100854
基金项目:国家自然科学基金(6149069502)
详细信息
作者简介:孙旺：孙 旺(1993–)，男，硕士研究生，研究方向为太赫兹波段材料的密度泛函方法
李粮生(1981–)，男，研究员，研究方向为太赫兹技术、量子技术和统计物理
张景：张 景(1987–)，男，博士后，研究方向为太赫兹测量技术
殷红成(1967–)，男，研究员，博士生导师，主要研究方向为电磁散射、雷达目标特性、目标识别等
通讯作者:李粮生 ? liliangshengbititp@163.com
中图分类号:TN952计量
文章访问数:1471
HTML全文浏览量:328
PDF下载量:441
被引次数:0
出版历程
收稿日期:2017-11-03
修回日期:2018-01-21
网络出版日期:2018-02-01
Theoretical and Experimental Study on the Permittivity of CdTe in the Terahertz Band
Sun Wang,Li Liangsheng,,
Zhang Jing,
Yin Hongcheng
Science and Technology on Electromagnetic Scattering Laboratory, Beijing 100854, China
Funds:The National Natural Science Foundation of China (6149069502)
摘要
摘要:该文采用密度泛函理论研究了闪锌矿型碲化镉的声子色散谱、特征向量及晶格振动频率，获得了碲化镉介电常数随频率变化的理论值。通过太赫兹时域光谱系统测量碲化镉单晶的介电常数，该实验结果与局域密度近似修正、广义梯度近似修正和广义梯度近似修正的计算结果吻合较好。最后，3种近似交换关联势的计算结果之间存在一定差异性，该差异性结果表明太赫兹波段碲化镉的介电常数由电子声子耦合所主导，但是横波和纵波声子频率敏感于电子密度分布。
关键词:碲化镉/
介电常数/
反射率/
横/纵光学模/
时域光谱
Abstract:The phonon dispersion spectrum, eigenvector, and lattice vibration frequency of cadmium telluride with a zinc blende structure have been investigated using the density functional theory, and the permittivity of cadmium telluride crystal is numerically calculated. The permittivity of the crystal is measured using the terahertz time-domain spectroscopy system. The experimental results are consistent with the theoretical calculations on the modified local density approximation, the general gradient approximation, and the modified general gradient approximation. Finally, the differences among the three approximate exchange correlation potentials indicate that in the terahertz region, the permittivity of cadmium telluride is dominantly contributed by the coupling between electron and phonon; however, the phonon frequencies of transverse wave and longitudinal wave were sensitive to electron density distribution.
Key words:Cadmium telluride/
Permittivity/
Reflectivity/
Transverse/longitudinal optical mode/
Time domain spectroscopy
PDF全文下载地址:
https://plugin.sowise.cn/viewpdf/198_480_R17096
