Resonant Raman Scattering in MoS2

2015 ◽  
Vol 1726 ◽  
Author(s):  
Katarzyna Gołasa ◽  
Magdalena Grzeszczyk ◽  
Przemysław Leszczyński ◽  
Karol Nogajewski ◽  
Marek Potemski ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Optical Emission ◽  
Sample Thickness ◽  
High Symmetry ◽  
Acoustic Phonons ◽  
Longitudinal Acoustic ◽  
Transverse Acoustic ◽  
Raman Modes ◽  
Resonant Raman ◽  
Resonant Raman Scattering

ABSTRACTResonant 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.

Resonant-Raman Scattering of ZnO Crystallites: the Quasi Nature of the LO Mode

2004 ◽  
Vol 831 ◽  
Author(s):  
Xiang-Bai Chen ◽  
John L. Morrison ◽  
Jesse Huso ◽  
Jonathan G. Metzger ◽  
Leah Bergman ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Single Crystal ◽  
Electronic States ◽  
Mode Frequency ◽  
Mode Behavior ◽  
Raman Modes ◽  
Resonant Raman ◽  
Resonant Raman Scattering ◽  
Zno Single Crystal ◽  
Size Confinement

ABSTRACTThe Raman modes of ZnO crystallites of the wurtzite structure were investigated via micro-Raman scattering at resonant and out-of-resonant conditions. The E2 mode was the predominant mode in the spectra for out-of-resonant conditions. For the resonant conditions one mode at the spectral range of the LO's of ZnO single crystal was the predominant mode: its frequency was found to be at ∼ 580 cm−1. The A1(LO) and the E1(LO) modes of a reference ZnO single crystal were found to be 568 cm−1 and 586 cm−1 respectively. Two possible mechanisms were considered that may explain the mode frequency of the crystallites: it can be regarded as a confined E1(LO) mode or as a quasi-LO mode. The UV-photoluminescence of the crystallites was found to have the same energy as that of the single crystal ∼ 3.3 eV, indicating the lack of size-confinement of the electronic states in the crystallites, and inter alia that of the phonon states. Our analysis indicated that the observed frequency can be explained in terms of Loudon's model of a quasi-mode behavior which is due to the crystallites tilt.

Resonant Raman scattering of nanocavity-confined acoustic phonons

2009 ◽  
Vol 79 (3) ◽  
Author(s):  
N. D. Lanzillotti-Kimura ◽  
A. Fainstein ◽  
B. Jusserand ◽  
A. Lemaître
Keyword(s):  
Raman Scattering ◽  
Acoustic Phonons ◽  
Resonant Raman ◽  
Resonant Raman Scattering

Double-resonant Raman scattering with optical and acoustic phonons in carbon nanotubes

2018 ◽  
Vol 97 (21) ◽  
Author(s):  
Christoph Tyborski ◽  
Asmus Vierck ◽  
Rohit Narula ◽  
Valentin N. Popov ◽  
Janina Maultzsch
Keyword(s):  
Carbon Nanotubes ◽  
Raman Scattering ◽  
Acoustic Phonons ◽  
Resonant Raman ◽  
Resonant Raman Scattering

Resonant Raman Scattering of Cavity Confined Acoustic Phonons in an Optical Microcavity

2007 ◽  
Author(s):  
N. D. Lanzillotti-Kimura ◽  
A. Fainstein ◽  
B. Jusserand ◽  
A. Lemaître
Keyword(s):  
Raman Scattering ◽  
Acoustic Phonons ◽  
Optical Microcavity ◽  
Resonant Raman ◽  
Resonant Raman Scattering

Resonant raman scattering and dispersion of polar optical and acoustic phonons in hexagonal inn

2010 ◽  
Vol 44 (2) ◽  
pp. 161-170 ◽  
Author(s):  
V. Yu. Davydov ◽  
A. A. Klochikhin ◽  
A. N. Smirnov ◽  
I. Yu. Strashkova ◽  
A. S. Krylov ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Acoustic Phonons ◽  
Resonant Raman ◽  
Resonant Raman Scattering

Resonant Raman and Micro-Raman Scattering from Si Matrix with Unburied β-FeSi2 Nanolayers

2008 ◽  
Vol 8 (2) ◽  
pp. 775-779
Author(s):  
M. Marinova ◽  
M. Baleva ◽  
G. Zlateva
Keyword(s):  
Raman Scattering ◽  
Incident Angle ◽  
Incident Light ◽  
Interband Transitions ◽  
Surface Polariton ◽  
Scattering Geometry ◽  
Back Scattering ◽  
Raman Modes ◽  
Resonant Raman ◽  
Resonant Raman Scattering

Samples, representing Si matrix with nanolayers of the semiconducting β-FeSi2 silicide are studied by Raman scattering. The unpolarized Raman spectra of the samples are measured in two different configurations. It is found that the characteristic β-FeSi2 Raman modes are seen in the spectra, taken at incident angle of about 45°, while only comparatively intensive broad feature is detected in a back-scattering geometry. The difference in the spectra is interpreted with the appearance of surface polariton modes of the optical phonons in the nanosized layers in near back-scattering geometry. The resonant Raman scattering is investigated at incident light angle of about 45° and the energies of the interband transitions in the investigated energy range are determined. It is known that the resonant Raman scattering appears to be even more precise method for the determination of the interband transitions energies than the modulation spectroscopy. Thus we claim that the energies determined here are firstly determined with such a precision.

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