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News 28.06.2024
Professor Slava Rotkin from Penn State University completes sabbatical with our research group
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News 22.06.2023
New publication: Probing Enhanced Electron-Phonon Coupling in Graphene by Infrared Resonance Raman Spectroscopy
![../../images/news/2023_PRL_Venenzi.png](../../images/news/2023_PRL_Venenzi.png)
Phys. Rev. Lett. 130, 256901 (2023) We report on resonance Raman spectroscopy measurements with excitation photon energy down to 1.16 eV on graphene, to study how low-energy carriers interact with lattice vibrations. Thanks to the excitation energy close to the Dirac point at K, we unveil a giant increase of the intensity ratio between the double-resonant 2D and 2D′ peaks with respect to that measured in graphite. Comparing with fully ab initio theoretical calculations, we conclude that the observation is explained by an enhanced, momentum-dependent coupling between electrons and Brillouin zone-boundary optical phonons. This finding applies to two-dimensional Dirac systems and has important consequences for the modeling of transport in graphene devices operating at room temperature.