Raman scattering excitation spectroscopy in monolayer WS${}_2$

Abstract

Resonant Raman scattering is investigated in monolayer WS${}_2$ at low temperature with the aid of an unconventional spectroscopy technique, $i.e.$, Raman scattering excitation (RSE). The RSE spectrum is made up by sweeping the excitation energy, when the detection energy is fixed in resonance with excitonic transitions related to neutral and/or charged excitons. We demonstrate that the shape of the RSE spectrum strongly depends on a selected detection energy. The out-going resonance with the neutral exciton leads to an extremely rich RSE spectrum displaying several Raman scattering features not reported so far, while no clear effect on the associated background photoluminescence is observed. Instead, a strong enhancement of the emission due to the negatively charged exciton is apparent when the out-going photons resonate with this exciton. Presented results show that the RSE spectroscopy can be a useful technique to study electron-phonon interactions in thin layers of transition metal dichalcogenides.

9 pages, 5 figures

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Cited by in corpus (22)

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• Optical response of monolayer, few-layer and bulk tungsten disulfide
• Singlet and triplet trions in WS${}_2$ monolayer encapsulated in hexagonal boron nitride
• Exciton states in monolayer MoSe2 and MoTe2 probed by upconversion spectroscopy
• Thermal Expansion Coefficient and Phonon Dynamics in Coexisting Allotropes of Monolayer WS2 Probed by Raman Scattering
• Temperature induced modulation of resonant Raman scattering in bilayer 2H-MoS${}_2$
• Tuning carrier concentration in a superacid treated MoS${}_2$ monolayer
• Resonance and antiresonance in Raman scattering in GaSe and InSe crystals
• Raman scattering from the bulk inactive out-of-plane B${}_{2\text{g}}^1$ mode in few-layer MoTe${}_2$
• Coupling of MoS${}_2$ Excitons with Lattice Phonons and Cavity Vibrational Phonons in Hybrid Nanobeam Cavities
• Influence of direct deposition of dielectric materials on the optical response of monolayer WS${}_2$
• Pressure-driven phase transitions in bulk HfS${}_2$
• The effect of temperature and excitation energy on Raman scattering in bulk HfS${}_2$
• Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
• Morphology-induced spectral modification of self-assembled WS2 pyramids
• Polarized and narrow excitonic emission from graphene-capped monolayer WS${}_2$ through resonant phonon relaxation
• Raman Digital Twin of Monolayer Janus Transition Metal Dichalcogenides
• Defect Passivation and Förster-Type Energy Exchange in H2Pc-TMD Organic-Inorganic Heterostructures
• Valley Emission and Upconversion in Isotopically Engineered Monolayer WS${}_2$ under Resonant Excitation
• Revealing the nanogeometry of WS2 nanoflowers by polarization-resolved Raman spectroscopy
• Mechanical Detuning of Exciton-Phonon Resonance in WS2