Resonance effects in the Raman scattering of monolayer and few-layer MoSe sub(2)

Using resonant Raman scattering spectroscopy with 25 different laser lines, we describe the Raman scattering spectra of monolayer and multilayer 2H-molybdenum diselenide (MoSe sub(2)) as well as the different resonances affecting the most pronounced features. For high-energy phonons, both A- and E-s...

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Bibliographic Details
Published in:Physical review. B 2016-04, Vol.93 (15)
Main Authors: Soubelet, P, Bruchhausen, A E, Fainstein, A, Nogajewski, K, Faugeras, C
Format: Article
Language:English
Subjects:
Condensed matter
Excitation
Excitons
Lasers
Multilayers
Phonons
Raman scattering
Resonance scattering
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Summary:Using resonant Raman scattering spectroscopy with 25 different laser lines, we describe the Raman scattering spectra of monolayer and multilayer 2H-molybdenum diselenide (MoSe sub(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 sub(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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.93.155407