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Giant magneto-optical Raman effect in a layered transition metal compound #MMPMID26884198
Ji J; Zhang A; Fan J; Li Y; Wang X; Zhang J; Plummer EW; Zhang Q
Proc Natl Acad Sci U S A 2016[Mar]; 113 (9): 2349-53 PMID26884198show ga
Raman scattering is a powerful technique to probe optical phonons in solids. It usually involves an electron-mediated three-step process, involving photon?electron, electron?phonon, and electron?photon interactions. In principle, manipulating electrons, for instance by applying a magnetic field, should affect Raman phonon intensity, yet there is no direct experimental measurement to demonstrate this. In this work we report the first realization to our knowledge of the idea in a prototype material, MoS2. From monolayer and bilayer to bulk MoS2 we observe a dramatic modification of Raman phonon intensity induced by magnetic field. Such a giant magneto-optical effect appearing at a monoatomic layer level and its technological implications for magnetic-optical devices should inspire a new branch of inelastic light scattering.