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Dielectric property of MoS2 crystal in terahertz and visible regions

机译：太赫兹和可见光区MoS2晶体的介电​​性能

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Two-dimensional materials such as MoS2 have attracted much attention in recent years due to their fascinating optoelectronic properties. The dielectric response of MoS2 crystal in both the terahertz (THz) and visible regions is studied in this work. Time-domain THz spectroscopy is employed for the THz property investigation. The real and imaginary parts of the complex dielectric constant of MoS2 crystal are found to follow a Drude model, which is due to the intrinsic carrier absorption. In the visible region, ellipsometry is used to investigate the dielectric response. The general trend of the complex dielectric constant is found to be described with a Lorentz model, while two remarkable dielectric response peaks are observed to be located at 1.85 and 2.03 eV, which has been attributed to the splitting arising from the combined effect of interlayer coupling and spin-orbit coupling. This work can be the research foundation for future optoelectronic applications with MoS2. (C) 2015 Optical Society of America
机译：诸如MoS2之类的二维材料由于其引人入胜的光电特性而近年来引起了很多关注。在这项工作中，研究了MoS2晶体在太赫兹（THz）和可见光区域的介电响应。时域太赫兹光谱用于太赫兹特性研究。发现MoS2晶体的复介电常数的实部和虚部遵循Drude模型，这是由于固有载流子吸收所致。在可见光区域，椭圆偏振法用于研究介电响应。发现用Lorentz模型描述了复介电常数的一般趋势，而观察到两个显着的介电响应峰位于1.85和2.03 eV，这归因于层间耦合的组合效应引起的分裂和自旋轨道耦合。这项工作可以成为MoS2未来光电应用的研究基础。 （C）2015年美国眼镜学会

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