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

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