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Direct identification of monolayer rhenium diselenide by an individual diffraction pattern

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分类：O436.1[机械工程—光学工程;理学—光学;理学—物理] TN911.7[电子电信—通信与信息系统;电子电信—信息与通信工程]
作者机构：[1]State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China, [2]School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China, [3]Graduate Institute of Applied Science and Technology, Taiwan University of Science and Technology, Taipei 106, Taiwan, China, [4]College of Electronic Engineering, South China Agricultural University, Guangzhou 510642, China, [5]Department of Physics, University of York, Heslington, York YO 10 5DD, UK
相关基金：This work is financially supported by the National Basic Research Program of China （Nos. 2014CB932500 and 2015CB921004）, the National Natural Science Foundation of China （Nos. 51472215, 51222202, 61571197 and 61172011）, the 111 project （No. B16042） and MOST 104-2112-M-011-002-MY3. The authors would like to thank Prof. Christoph Koch fromHumbold University of Berlin for the fruitful dis- cussions on multislice simulations. J. Y. acknowledges the EPSRC （UK） funding （Nos. EP/G070326 and EP/ J022098） and supports from Pao Yu-Kong International Foundation for a Chair Professorship in ZJU. This work made use of the resources of the Center of Electron Microscopy of Zhejiang University

作者： Zhen Fei[1], Bo Wang[2], Ching-Hwa Ho[3], Fang Lin[4], Jun Yuan[1,5], Ze Zhang[1], Chuanhong Jin[1]

关键词：直接识别, 衍射图案, 硅化, 单层, 二维材料, 铼, 低对称性, 三斜晶系, rhenium diselenide,electron diffraction,monolayer,reciprocal rel-rod

中文摘要：

在当前的广泛的研究分层二维(2D ) 材料，与象 graphene， hBN，和瞬间 ₂, 那样的六角形的结构相比，低对称的 2D 材料在各向异性的设备为应用显示出大潜力。金来 diselenide (ReSe ₂) 拥有体积空格组 \(P\bar 1 \) 并且与使变形的 cadmium-iodide-type 结构属于三斜晶系的水晶系统。这里，我们建议一个电子把单层 ReSe ₂ 膜与多层的 ReSe ₂ 和它的二不同垂直取向区分开来的基于衍射的方法。我们的方法对另外的低对称的水晶系统也适用，包括三斜晶系、单斜晶的格子，只要他们的第三单位房间基础向量不对基础飞机垂直。我们的试验性的结果被 kinematical 电子衍射理论和相应模拟很好解释。我们到另外的 2D 材料的方法的归纳例如 graphene，也被讨论。

英文摘要：

In the current extensive studies of layered two-dimensional （2D） materials, compared to hexagonal structures such as graphene, hBN, and MoS2, low- symmetry 2D materials have shown great potential for applications in anisotropic devices. Rhenium diselenide （ReSe2） possesses the bulk space group P1 and belongs to the triclinic crystal system with a deformed cadmium-iodide-type structure. Here, we propose an electron diffraction-based method to distinguish the monolayer ReSe2 membrane from multilayer ReSe2 and its two different vertical orientations. Our method is also applicable to other low-symmetry crystal systems, including both triclinic and monoclinic lattices, as long as their third unit-cell basis vectors are not perpendicular to the basal plane. Our experimental results are well explained by kinematical electron diffraction theory and the corresponding simulations. Generalization of our method to other 2D materials, such as ~：raphene, is also discussed.

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