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Sci Adv. 2018 Dec 14;4(12):eaau6252. doi: 10.1126/sciadv.aau6252. eCollection 2018 Dec.

Discovering the forbidden Raman modes at the edges of layered materials.

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School of Physics, Beijing Institute of Technology, Beijing 100081, China.
Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China.
Department of Physics, Renmin University of China, Beijing 100872, China.
Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, China.
International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, Shenzhen University, Shenzhen 518060, China.


The edges of layered materials have unique properties that substantially differ from the body regions. In this work, we perform a systematic Raman study of the edges of various layered materials (MoS2, WS2, WSe2, PtS2, and black phosphorus). The Raman spectra of the edges feature newly observed forbidden Raman modes, which are originally undetectable from the body region. By selecting the edge type and the polarization directions of the incident and scattered light, all forbidden Raman modes are distinctly detected. Optical simulations show that the edges of layered materials drastically distort the electromagnetic fields of both the incident and scattered light, so that the light interacts with the edges in a distinct way, which differs from its interactions with the body regions.

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