Probing enhanced electron-phonon coupling in graphene by infrared resonance Raman spectroscopy
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2022
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| _version_ | 1866908397833551872 |
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| author | Venanzi, Tommaso Graziotto, Lorenzo Macheda, Francesco Sotgiu, Simone Ouaj, Taoufiq Stellino, Elena Fasolato, Claudia Postorino, Paolo Mišeikis, Vaidotas Metzelaars, Marvin Kögerler, Paul Beschoten, Bernd Coletti, Camilla Roddaro, Stefano Calandra, Matteo Ortolani, Michele Stampfer, Christoph Mauri, Francesco Baldassarre, Leonetta |
| author_facet | Venanzi, Tommaso Graziotto, Lorenzo Macheda, Francesco Sotgiu, Simone Ouaj, Taoufiq Stellino, Elena Fasolato, Claudia Postorino, Paolo Mišeikis, Vaidotas Metzelaars, Marvin Kögerler, Paul Beschoten, Bernd Coletti, Camilla Roddaro, Stefano Calandra, Matteo Ortolani, Michele Stampfer, Christoph Mauri, Francesco Baldassarre, Leonetta |
| contents | 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 $\mathbf{K}$, we unveil a giant increase of the intensity ratio between the double-resonant 2D and 2D$^\prime$ peaks with respect to that measured in graphite. Comparing with fully \textit{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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2212_01342 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Probing enhanced electron-phonon coupling in graphene by infrared resonance Raman spectroscopy Venanzi, Tommaso Graziotto, Lorenzo Macheda, Francesco Sotgiu, Simone Ouaj, Taoufiq Stellino, Elena Fasolato, Claudia Postorino, Paolo Mišeikis, Vaidotas Metzelaars, Marvin Kögerler, Paul Beschoten, Bernd Coletti, Camilla Roddaro, Stefano Calandra, Matteo Ortolani, Michele Stampfer, Christoph Mauri, Francesco Baldassarre, Leonetta Mesoscale and Nanoscale Physics Materials Science 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 $\mathbf{K}$, we unveil a giant increase of the intensity ratio between the double-resonant 2D and 2D$^\prime$ peaks with respect to that measured in graphite. Comparing with fully \textit{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. |
| title | Probing enhanced electron-phonon coupling in graphene by infrared resonance Raman spectroscopy |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2212.01342 |