Edge Nonlinear Optics on a MoS2 Atomic Monolayer
Edge Nonlinear Optics on a MoS2 Atomic Monolayer
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DOI：
10.1126/science.1250564
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发表时间：
2014-05-02
期刊：
影响因子：
56.9
通讯作者：
Zhang, Xiang
中科院分区：
文献类型：
--
作者：
Yin, Xiaobo;Ye, Ziliang;Zhang, Xiang
晶体表面的平移对称破缺可以形成二维电子态。研究了过渡金属二硫化物二硫化钼（MoS2）单原子膜的一维非线性光学边缘态。二维晶体边缘的电子结构变化导致了强共振非线性光学磁化率，从而允许对二维材料的原子边缘和边界进行直接光学成像。利用非线性光学响应的对称性，我们开发了一种非线性光学成像技术，可以在大规模上快速和全光地确定二维材料的晶体取向。我们的技术为理解和利用新兴的二维材料和器件提供了一条途径。
The translational symmetry breaking of a crystal at its surface may form two-dimensional (2D) electronic states. We observed one-dimensional nonlinear optical edge states of a single atomic membrane of molybdenum disulfide (MoS2), a transition metal dichalcogenide. The electronic structure changes at the edges of the 2D crystal result in strong resonant nonlinear optical susceptibilities, allowing direct optical imaging of the atomic edges and boundaries of a 2D material. Using the symmetry of the nonlinear optical responses, we developed a nonlinear optical imaging technique that allows rapid and all-optical determination of the crystal orientations of the 2D material at a large scale. Our technique provides a route toward understanding and making use of the emerging 2D materials and devices.