Two-phonon processes in II-VI semiconductors investigated with terahertz time-domain spectroscopy

被引：0

作者：

Schall, M. ^{[1
]}

Walther, M. ^{[1
]}

Helm, H. ^{[1
]}

Jepsen, P.U. ^{[1
]}

机构：

[1] Univ of Freiburg, Freiburg, Germany

来源：

| 2000年 / IEEE, Piscataway卷

关键词：

Band structure - Electron resonance - Laser modes - Optical properties - Refractive index - Semiconducting cadmium compounds - Semiconducting zinc compounds - Spectroscopy - Time domain analysis;

D O I：

10.1109/cleo.2000.907259

中图分类号：

学科分类号：

摘要：

The authors investigate via terahertz time-domain spectroscopy the temperature dependent FIR properties of the II-VI semiconductor compounds ZnTe and CdTe in the frequency range 200 GHz -2.3 THz. At frequencies below the first transverse optical phonon resonance, the absorption and dispersion show resonance features in addition to the fundamental phonon mode. Gallot et al. (1999) assigned the 1.6-THz absorption band in ZnTe to a fundamental phonon mode. In this paper, the authors categorize this absorption band and other spectral features below the transverse optical resonance as second-order phonon interactions between acoustical and optical modes. The authors use the different temperature behavior of the two-phonon processes to distinguish between sum- and difference modes. This is experimentally realized by using a standard THz spectrometer.

引用