| Time：1140917 (Wed.) 14:20~16:20 Speaker：Prof.Marcos A. Pimenta Department of Physics, Federal University of Minas Gerais Belo Horizonte, Brazil Title：Probing electrons and phonons in 2D materials by resonance Raman spectroscopy Abstract： In this seminar I will discuss the use of Raman spectroscopy to study phonons and electron-phonon interactions in 2D materials. I will start reviewing the Raman spectra of graphene, showing that measurements performed by changing the energy of the incident photons provide information about the electronic structure of the material. I will then focus on the resonance Raman effect in twisted bilayer graphene (TBG), presenting experimental results performed in TBG samples with different twisting angles that allow the distinction between intralayer and interlayer electron-phonon (el-ph) interactions. I will then present results in 2D crystals of the transition metal dichalcogenide (TMD) family starting with the semiconducting MoS2 crystal, where we can observe the scattering of electrons between different valleys in the electronic structure by acoustic phonons. Finally, I will present angle-resolved polarized Raman measurements in triclinic ReSe2 and show that the Raman tensor elements are given by complex numbers due to the resonance Raman effect. Place：S101, Gongguan Campus, NTNU |
