Dispersive Raman Mode of Layered Compound 2H-MoS<sub>2</sub> under the Resonant Condition

Sekine, Tomoyuki; Uchinokura, K.; Nakashizu, T.; Matsuura, Etsuyuki; Yoshizaki, Ryozo

doi:10.1143/jpsj.53.811

Cited by 102 publications

(120 citation statements)

References 20 publications

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“…The distinctive identity of the ∼377 cm −1 peak is further confirmed by its presence in pristine 1L-MoS 2 , where it manifests itself as a weak shoulder located at the low-frequency side of the E peak. The existence of a similar shoulder has been previously reported for bulk MoS 2 , and it has been assigned to Raman-inactive TO phonons with E 2 1u symmetry [33], arising from an atomic displacement pattern similar to that of E 1 2g . This assignment is questionable, as reflectivity measurements show this peak at the higher frequency side of the E peak [34].…”

Section: Resultssupporting

confidence: 80%

Effect of disorder on Raman scattering of single-layerMoS2

et al. 2015

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We determine the effect of defects induced by ion bombardment on the Raman spectrum of single-layer molybdenum disulfide. The evolution of both the linewidths and frequency shifts of the first-order Raman bands with the density of defects is explained with a phonon confinement model, using density functional theory to calculate the phonon dispersion curves. We identify several defect-induced Raman scattering peaks arising from zone-edge phonon modes. Among these, the most prominent is the LA(M) peak at ∼227 cm −1 and its intensity, relative to the one of first-order Raman bands, is found to be proportional to the density of defects. These results provide a practical route to quantify defects in single-layer MoS 2 using Raman spectroscopy and highlight an analogy between the LA(M) peak in MoS 2 and the D peak in graphene.

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Section: Resultssupporting

confidence: 80%

Effect of disorder on Raman scattering of single-layerMoS2

et al. 2015

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“…The resonance Raman spectra show that multiple modes are shifted from the first-order Raman frequencies, which suggests that the electronic transitions are strongly coupled with phonon modes. There are several reports of this resonant Raman scattering phenomenon in MoS2 [78,79,86,91,93,[98][99][100]. All of these studies are in general agreement on the attribution of the peaks observed in the resonant Raman scattering spectrum, which suggests coupling between vibrational modes and longitudinal acoustic phonon modes.…”

Section: Resonant Raman Scatteringsupporting

confidence: 71%

Recent Advancement on the Optical Properties of Two-Dimensional Molybdenum Disulfide (MoS2) Thin Films

et al. 2015

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Abstract:The emergence of two-dimensional (2D) materials has led to tremendous interest in the study of graphene and a series of mono-and few-layered transition metal dichalcogenides (TMDCs). Among these TMDCs, the study of molybdenum disulfide (MoS2) has gained increasing attention due to its promising optical, electronic, and optoelectronic properties. Of particular interest is the indirect to direct band-gap transition from bulk and few-layered structures to mono-layered MoS2, respectively. In this review, the study of these properties is summarized. The use of Raman and Photoluminescence (PL) spectroscopy of MoS2 has become a reliable technique for differentiating the number of molecular layers in 2D MoS2.

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“…The mode at ∼420 cm −1 is highly dispersive and explained by Sekine et al as a second-order Raman process, where a polariton created by the incident laser in a photon-like branch will first be scattered by emitting a longitudinal dispersive quasiacoustic (QA) phonon along Γ-A, and then scattered by emitting a E 2 1u phonon (which is dispersionless along Γ-A) into the exciton-like final state. 98 Here, Γ-A is perpendicular to the 2D Brillouin plane. The QA phonon at the Γ point is B (Γ-A) based on the excitonpolariton dispersion.…”

Section: Resonant Raman Scattering In Tmdsmentioning

confidence: 99%

Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material

et al. 2015

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Two-dimensional (2D) transition metal dichalcogenide (TMD) nanosheets exhibit remarkable electronic and optical properties. The 2D features, sizable bandgaps, and recent advances in the synthesis, characterization, and device fabrication of the representative MoS2, WS2, WSe2, and MoSe2 TMDs make TMDs very attractive in nanoelectronics and optoelectronics. Similar to graphite and graphene, the atoms within each layer in 2D TMDs are joined together by covalent bonds, while van der Waals interactions keep the layers together. This makes the physical and chemical properties of 2D TMDs layer dependent. In this review, we discuss the basic lattice vibrations of monolayer, multilayer, and bulk TMDs, including high-frequency optical phonons, interlayer shear and layer breathing phonons, the Raman selection rule, layer-number evolution of phonons, multiple phonon replica, and phonons at the edge of the Brillouin zone. The extensive capabilities of Raman spectroscopy in investigating the properties of TMDs are discussed, such as interlayer coupling, spin-orbit splitting, and external perturbations. The interlayer vibrational modes are used in rapid and substrate-free characterization of the layer number of multilayer TMDs and in probing interface coupling in TMD heterostructures. The success of Raman spectroscopy in investigating TMD nanosheets paves the way for experiments on other 2D crystals and related van der Waals heterostructures.

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Dispersive Raman Mode of Layered Compound 2H-MoS₂ under the Resonant Condition

Cited by 102 publications

References 20 publications

Effect of disorder on Raman scattering of single-layerMoS2

Effect of disorder on Raman scattering of single-layerMoS2

Recent Advancement on the Optical Properties of Two-Dimensional Molybdenum Disulfide (MoS2) Thin Films

Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material

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Dispersive Raman Mode of Layered Compound 2H-MoS2 under the Resonant Condition

Cited by 102 publications

References 20 publications

Effect of disorder on Raman scattering of single-layerMoS2

Effect of disorder on Raman scattering of single-layerMoS2

Recent Advancement on the Optical Properties of Two-Dimensional Molybdenum Disulfide (MoS2) Thin Films

Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material

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Dispersive Raman Mode of Layered Compound 2H-MoS₂ under the Resonant Condition