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Resonant Raman Scattering in MoS2

Published online by Cambridge University Press:  23 February 2015

Katarzyna Gołasa
Affiliation:
Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
Magdalena Grzeszczyk
Affiliation:
Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
Przemysław Leszczyński
Affiliation:
LNCMI, CNRS-UJF-UPS-INSA, 25 rue des Martyrs, 38042 Grenoble, France
Karol Nogajewski
Affiliation:
LNCMI, CNRS-UJF-UPS-INSA, 25 rue des Martyrs, 38042 Grenoble, France
Marek Potemski
Affiliation:
LNCMI, CNRS-UJF-UPS-INSA, 25 rue des Martyrs, 38042 Grenoble, France
Adam Babiński
Affiliation:
Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
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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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