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arXiv · 1603.05172

Resonance effects in the Raman scattering of mono- and few layers MoSe$_2$

P. Soubelet·A. E. Bruchhausen·A. Fainstein·K. Nogajewski·C. Faugeras
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Abstract

Using resonant Raman scattering spectroscopy with 25 different laser lines, we describe the Raman scattering spectra of mono- and multi-layers 2H-molybdenum diselenide (MoSe$_2$) as well as the different resonances affecting the most pronounced features. For high-energy phonons, both A- and E- symmetry type phonons present resonances with A and B excitons of MoSe$_2$ together with a marked increase of intensity when exciting at higher energy, close to the C exciton energy. We observe symmetry dependent exciton-phonon coupling affecting mainly the low-energy rigid layer phonon modes. The shear mode for multilayer displays a pronounced resonance with the C exciton while the breathing mode has an intensity that grows with the excitation laser energy, indicating a resonance with electronic excitations at energies higher than that of the C exciton.

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P. Soubelet, A. E. Bruchhausen, A. Fainstein, K. Nogajewski, C. Faugeras. 2016-03-16. Resonance effects in the Raman scattering of mono- and few layers MoSe$_2$. https://doi.org/10.1103/physrevb.93.155407

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