Interlayer Interactions in Anisotropic Atomically-thin Rhenium Diselenide
Interlayer Interactions in Anisotropic Atomically-thin Rhenium Diselenide
复制标题
各向异性原子薄二硒化铼的层间相互作用
DOI：
10.1007/s12274-015-0865-0
复制
发表时间：
2015
期刊：
影响因子：
9.9
通讯作者：
Han Wang
中科院分区：
文献类型：
--
作者：
Huan Zhao;Jiangbin Wu;Hongxia Zhong;Qiushi Guo;Xiaomu Wang;Fengnian Xia;Li Yang;Ping-Heng Tan;Han Wang
在本工作中，我们研究了层间声子振动模式，层数依赖的光学带隙，和各向异性的光致发光（PL）光谱的原子薄的硒化铼（ReSe 2）的第一次。超低频层间拉曼谱和偏振分辨高频拉曼谱可用于确定ReSe 2的层数和晶体取向。此外，PL测量显示材料的各向异性的光发射强度，其带隙从1.26 eV的散装增加到1.32 eV的单层。的层数依赖的拉曼模式和PL光谱的研究揭示了相对较弱的货车德瓦尔的相互作用和二维（2D）量子限制在原子薄的ReSe 2。在单层和多层ReSe 2中有趣的各向异性层间相互作用和可调谐光学跃迁的实验观察为进一步探索这种材料在近红外光谱中发挥作用的各向异性光电器件的发展奠定了基础，这对于光通信和红外传感中的许多应用都很重要。
In this work, we study the interlayer phonon vibration modes, the layer-numberdependent optical bandgap, and the anisotropic photoluminescence (PL) spectra of atomically thin rhenium diselenide (ReSe2) for the first time. The ultralow frequency interlayer Raman spectra and the polarization-resolved high frequency Raman spectra in ReSe2allow the identification of its layer number and crystal orientation. Furthermore, PL measurements show the anisotropic optical emission intensity of the material with its bandgap increasing from 1.26 eV in the bulk to 1.32 eV in the monolayer. The study of the layer-number dependence of the Raman modes and the PL spectra reveals relatively weak van der Waal’s interaction and two-dimensional (2D) quantum confinement in the atomically thin ReSe2. The experimental observation of the intriguing anisotropic interlayer interaction and tunable optical transition in monolayer and multilayer ReSe2establishes the foundation for further exploration of this material in the development of anisotropic optoelectronic devices functioning in the near-infrared spectrum, which is important for many applications in optical communication and infrared sensing.