Excitons in molybdenum disulphide

Fortin, E.; Raga, F.

doi:10.1103/physrevb.11.905

Cited by 75 publications

(76 citation statements)

References 42 publications

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“…It is interesting to compare these predictions with experimental findings on bulk MoS 2 for which the absorption spectrum has been measured already in the 1970s 1,2,4 . Transitions that were associated with the A-exciton at the K-points of the Brillioun zone have been observed around 1.92, 1.96 and 1.99 eV.…”

Section: Multilayer Structuresmentioning

confidence: 84%

“…The excitonic series observed in the optical absorption spectra could be attributed to transitions at the K-points of the Brilliouin zone which nowadays are often referred to as Dirac points. [1][2][3][4][5][6] However, as bulk TMDCs are indirect bandgap semiconductors, these materials have only played a minor role in the field of semiconductor optics in the following decades.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the effective layer thickness on the ground-state and excitonic properties of transition-metal dichalcogenide systems

2018

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A self-consistent scheme for the calculations of the interacting groundstate and the near bandgap optical spectra of mono-and multilayer transition-metal-dichalcogenide systems is presented. The approach combines a dielectric model for the Coulomb interaction potential in a multilayer environment, gap equations for the renormalized groundstate, and the Dirac-Wannier-equation to determine the excitonic properties. To account for the extension of the individual monolayers perpendicular to their basic plane, an effective thickness parameter in the Coulomb interaction potential is introduced. Numerical evaluations for the example of MoS2 show that the resulting finite size effects lead to significant modifications in the optical spectra, reproducing the experimentally observed non hydrogenic features of the excitonic resonance series. Applying the theory for multi-layer configurations, a consistent description of the near bandgap optical properties is obtained all the way from monolayer to bulk. In addition to the well-known in-plane excitons, also interlayer excitons occur in multilayer systems suggesting a reinterpretation of experimental results obtained for bulk material.

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Section: Multilayer Structuresmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Influence of the effective layer thickness on the ground-state and excitonic properties of transition-metal dichalcogenide systems

2018

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“…11,12 More recently, long-lived (>1 ns) valley polarization was observed in monolayer MoS 2 . 13,14 While the steady-state optical spectroscopy of MoS 2 2D crystals has been reported, 1,15,16 very limited work has been done on ultrafast time-resolved spectroscopy of this system. 17À19 Recent temperature-dependent PL lifetime measurements provided important information on exciton lifetimes in monolayers.…”

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confidence: 99%

Exciton Dynamics in Suspended Monolayer and Few-Layer MoS₂ 2D Crystals

Yan²,

et al. 2013

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Femtosecond transient absorption spectroscopy and microscopy were employed to study exciton dynamics in suspended and Si 3 N 4 substrate-supported monolayer and few-layer MoS 2 2D crystals. Exciton dynamics for the monolayer and few-layer structures were found to be remarkably different from those of thick crystals when probed at energies near that of the lowest energy direct exciton (A exciton). The intraband relaxation rate was enhanced by more than 40 fold in the monolayer in comparison to that observed in the thick crystals, which we attributed to defect assisted scattering. Faster electronÀhole recombination was found in monolayer and few-layer structures due to quantum confinement effects that lead to an indirectÀdirect band gap crossover. Nonradiative rather than radiative relaxation pathways dominate the dynamics in the monolayer and few-layer MoS 2 . Fast trapping of excitons by surface trap states was observed in monolayer and few-layer structures, pointing to the importance of controlling surface properties in atomically thin crystals such as MoS 2 along with controlling their dimensions.

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“…32) to ∼1m 0 . [33][34][35] In the absence of a definitive estimate of m eff , we checked the dependence of the induced charge distribution on m eff by performing a Thomas-Fermilike calculation using a similar model for the screening of a MoS 2 multilayer as in Ref. 36.…”

Section: Superconducting Phase and Open Questionsmentioning

confidence: 99%

Interactions and superconductivity in heavily doped MoS2

2013

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We analyze the microscopic origin and the physical properties of the superconducting phase recently observed in MoS 2 . We show how the combination of the valley structure of the conduction band, the density dependence of the screening of the long-range Coulomb interactions, the short-range electronic repulsion, and the relative weakness of the electron-phonon interactions makes possible the existence of a phase where the superconducting order parameter has opposite signs in different valleys, resembling the superconductivity found in the pnictides and cuprates.

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Excitons in molybdenum disulphide

Cited by 75 publications

References 42 publications

Influence of the effective layer thickness on the ground-state and excitonic properties of transition-metal dichalcogenide systems

Influence of the effective layer thickness on the ground-state and excitonic properties of transition-metal dichalcogenide systems

Exciton Dynamics in Suspended Monolayer and Few-Layer MoS₂ 2D Crystals

Interactions and superconductivity in heavily doped MoS2

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Excitons in molybdenum disulphide

Cited by 75 publications

References 42 publications

Influence of the effective layer thickness on the ground-state and excitonic properties of transition-metal dichalcogenide systems

Influence of the effective layer thickness on the ground-state and excitonic properties of transition-metal dichalcogenide systems

Exciton Dynamics in Suspended Monolayer and Few-Layer MoS2 2D Crystals

Interactions and superconductivity in heavily doped MoS2

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Exciton Dynamics in Suspended Monolayer and Few-Layer MoS₂ 2D Crystals