Abstract
Resonant Raman scattering in molybdenum disulfide (MoS2) is studied as a function of the sample thickness. Optical emission from 1ML, 2ML, 3ML and bulk MoS2 is investigated both at room and at liquid helium temperature. The experimental results are analysed in terms of the recently proposed attribution of the Raman peaks to multiphonon replica involving transverse acoustic phonons from the vicinity of the high-symmetry M point of the MoS2 Brillouin zone. It is shown that the corresponding processes are quenched in a few monolayer samples much stronger than the modes involving longitudinal acoustic phonons. It is also shown that along with the disappearance of multiphonon replica, the Raman modes, which are in-active in bulk become active in a few-monolayer flakes.
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Acknowledgments
This work has been supported by Polish National Science Center under the Grants 2013/10/M/ST3/00791 and 2013/11/N/ST3/04067 and Polish funds for science. Funding from European Graphene Flagship and European Research Council (ERC-2012-AdG-320590-MOMB) as well as by board of the Mazovian Voivodeship within the framework of the project: “Development of science - the development of the region - supporting scholarships and support for Mazovia PhD” is also acknowledged.
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Gołasa, K., Grzeszczyk, M., Leszczyński, P. et al. Resonant Raman Scattering in MoS2. MRS Online Proceedings Library 1726, 7–12 (2014). https://doi.org/10.1557/opl.2015.168
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DOI: https://doi.org/10.1557/opl.2015.168