Anisotropic electron-photon-phonon coupling in layered MoS<sub>2</sub>

Journal of Physics. Condensed Matter : an Institute of Physics Journal
Deepu KumarPradeep Kumar

Abstract

Transition metal dichalcogenide, MoS2 has attracted lot of attention recently owing to its tunable visible range band gap and anisotropic electronic and transport properties. Here, we report comprehensive inelastic light scattering measurements on both CVD grown (horizontally and vertically aligned) flakes and mechanically exfoliated flakes of single crystal MoS2. We probe the anisotropic optical response by studying the polarization dependence intensity of the Raman active phonon modes as a function of different incident photon energy and flake thickness. Our polarization dependent Raman studies reveal strong anisotropic behavior reflected in the anomalous renormalization of the modes intensity as a function of flake thickness, phonons and photon energy. Our observations reflect the strong anisotropic light-matter interaction in this high crystalline symmetric layered MoS2 system especially for the in-plane vibrations, crucial for understanding as well as future application of these materials.

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Citations

Jul 30, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Birgit Weber, Peter A Dowben

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