论文标题
MOTE2作为整个可见和紫外线区域的天然双曲线材料
MoTe2 as a natural hyperbolic material across the visible and the ultraviolet region
论文作者
论文摘要
对于下一代光子和光电设备，双曲线材料特别感兴趣。由于人工分配材料在纳米结构的大小上本质上受到限制，因此在过去几年中，人们一直在寻找天然双曲线材料。在基于密度功能理论和多体扰动理论的第一原理工作中，我们研究了Mote2在单层，双层和散装形式中的基本介电响应，并发现它是一种天然的II型II型超纤维材料，在3和6 eV之间较低。从单层到散装，双曲线分散体的能量窗口被十分之一的电动汽车换成了蓝色。我们表明，激子效应和光学各向异性在MOTE2的双曲行为中起主要作用。我们的结果证实了分层材料作为光电，光子学和纳米成像应用的双曲线介质的潜力。
Hyperbolic materials are of particular interest for the next generation of photonic and optoelectronic devices. Since artificial metamaterials are intrinsically limited by the size of their nanostructured components, there has been a hunt for natural hyperbolic materials in the last few years. In a first-principles work based on density-functional theory and many-body perturbation theory, we investigate the fundamental dielectric response of MoTe2 in monolayer, bilayer, and bulk form, and find that it is a natural type-II hyperbolic material with low losses between 3 and 6 eV. Going from the monolayer to the bulk, the energy window of hyperbolic dispersion is blue-shifted by a few tenths of an eV. We show that excitonic effects and optical anisotropy play a major role in the hyperbolic behavior of MoTe2. Our results confirm the potential of layered materials as hyperbolic media for opto-electronics, photonics, and nano-imaging applications.
