OPTICAL-PROPERTIES OF ZNSE
OPTICAL-PROPERTIES OF ZNSE
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DOI：
10.1103/physrevb.43.9569
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发表时间：
1991-04-15
影响因子：
3.7
通讯作者：
TAGUCHI, T
中科院分区：
文献类型：
--
作者：
ADACHI, S;TAGUCHI, T
利用椭偏光谱法研究了室温下ZnSe在1.5 ~ 5.3 ev光子能量范围内的光学响应。测量的介电功能谱在E0、E0 + DELTA-0、E1和E1 + DELTA-1临界点（CP's）能量处显示出不同的结构。根据带间跃迁的简化模型对这些数据进行了分析。E0-(E0 + DELTA-0)结构用三维M0 CP表征，E1-(E1 + DELTA-1)结构用二维M0 CP表征，E2结构用经典洛伦兹振子（阻尼谐振子）表征。实验数据不能在单电子近似的框架内解释，因为激子效应可能会深刻地改变CP奇点结构。因此，建立模型是为了解释这些CP的激子效应；在整个光子能量范围内，我们的结果与实验结果吻合得很好。给出并分析了与ZnSe介电函数相关的光学常数，如折射率、消光系数和吸收系数。
We have studied the optical response of ZnSe in the 1.5-5.3-eV photon-energy range at room temperature by spectroscopic ellipsometry. The measured dielectric-function spectra reveal distinct structures at energies of the E0, E0 + DELTA-0, E1, and E1 + DELTA-1 critical points (CP's). These data are analyzed on the basis of a simplified model of the interband transitions. The E0-(E0 + DELTA-0) structures are characterized by a three-dimensional M0 CP, the E1-(E1 + DELTA-1) structures by a two-dimensional M0 CP, and the E2 structure by a classical Lorentzian oscillator (damped harmonic oscillator). The experimental data could not be explained within the framework of the one-electron approximation, since excitonic effects may profoundly modify the CP singularity structure. The model is thus made to account for the excitonic effects at these CP's; our results are in satisfactory agreement with the experiment over the entire range of photon energies. Dielectric-function-related optical constants of ZnSe, such as the refractive index, the extinction coefficient, and the absorption coefficient, are also presented and analyzed.