Investigation of the dispersion and the effective masses of excitons in bulk 2H-MoS2 using transition electron energy-loss spectroscopy

Abstract

We have investigated the electronic excitations in bulk 2H-MoS2 using electron energy-loss spectroscopy. The electron energy-loss spectra in the ΓM and ΓK directions were measured for various momentum transfer values. The results allow the identification of the A1 and B1 exciton peaks and in particular their energy-momentum dispersion. The dispersions exhibit approximately quadratic upward trends and slight anisotropies in the ΓM and ΓK directions. The fitted energy-momentum transfer functions allow the estimation of the effective masses of the excitons which are in close proximity to predicted values.

6 pages, 5 figures

References in corpus (3)

• Exciton band structure of monolayer MoS2
• Broad Band Optical Properties of Large Area Monolayer CVD Molybdenum Disulfide
• Electron Energy-Loss Spectroscopy: A versatile tool for the investigations of plasmonic excitations

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• Electron energy-loss spectrum and exciton band structure of ${\mathrm{WSe}}_2$ monolayer studied by ab initio Bethe-Salpeter equation calculations
• Dimensionality-Dependent Exciton Dispersion in a Single-Band Mott Insulator