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arXiv · 1502.04509

Investigation of Electron-Phonon Coupling in Epitaxial Silicene by In-situ Raman Spectroscopy

Jincheng Zhuang·Xun Xu·Yi Du·Kehui Wu·Lan Chen·Weichang Hao·Jiaou Wang·Wai Kong Yeoh·Xiaolin Wang·Shi Xue Dou
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Abstract

In this letter, we report that the special coupling between Dirac fermion and lattice vibrations, in other words, electron-phonon coupling (EPC), in silicene layers on Ag(111) surface was probed by an in-situ Raman spectroscopy. We find the EPC is significantly modulated due to tensile strain, which results from the lattice mismatch between silicene and the substrate, and the charge doping from the substrate. The special phonon modes corresponding to two-dimensional electron gas scattering at edge sites in the silicene were identified. Detecting relationship between EPC and Dirac fermion through the Raman scattering will provide a direct route to investigate the exotic property in buckled two-dimensional honeycomb materials.

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Jincheng Zhuang, Xun Xu, Yi Du, Kehui Wu, Lan Chen, Weichang Hao, Jiaou Wang, Wai Kong Yeoh, Xiaolin Wang, Shi Xue Dou. 2015-02-16. Investigation of Electron-Phonon Coupling in Epitaxial Silicene by In-situ Raman Spectroscopy. https://doi.org/10.1103/physrevb.91.161409

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