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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; Miseikis, Vaidotas; Metzelaars, Marvin; Kögerler, Paul; Beschoten, Bernd; Coletti, Camilla; Roddaro, Stefano; Calandra, Matteo; Ortolani, Michele; Stampfer, Christoph; Mauri, Francesco; Baldassarre, Leonetta.
Afiliação
  • Venanzi T; Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy.
  • Graziotto L; Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy.
  • Macheda F; Istituto Italiano di Tecnologia, Graphene Labs, Via Morego 30, I-16163 Genoa, Italy.
  • Sotgiu S; Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy.
  • Ouaj T; JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany.
  • Stellino E; Department of Physics and Geology, University of Perugia, via Alessandro Pascoli, 06123 Perugia, Italy.
  • Fasolato C; Institute for Complex System, National Research Council (ISC-CNR), 00185 Rome, Italy.
  • Postorino P; Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy.
  • Miseikis V; Istituto Italiano di Tecnologia, Graphene Labs, Via Morego 30, I-16163 Genoa, Italy.
  • Metzelaars M; Istituto Italiano di Tecnologia, Center for Nanotechnology Innovation @NEST, Piazza San Silvestro, 12-56126 Pisa, Italy.
  • Kögerler P; Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
  • Beschoten B; Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
  • Coletti C; JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany.
  • Roddaro S; Istituto Italiano di Tecnologia, Graphene Labs, Via Morego 30, I-16163 Genoa, Italy.
  • Calandra M; Istituto Italiano di Tecnologia, Center for Nanotechnology Innovation @NEST, Piazza San Silvestro, 12-56126 Pisa, Italy.
  • Ortolani M; Department of Physics, University of Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy.
  • Stampfer C; Department of Physics, University of Trento, Via Sommarive 14, 38123 Povo, Italy.
  • Mauri F; Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy.
  • Baldassarre L; JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany.
Phys Rev Lett ; 130(25): 256901, 2023 Jun 23.
Article em En | MEDLINE | ID: mdl-37418733
ABSTRACT
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.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Análise Espectral Raman / Grafite Tipo de estudo: Prognostic_studies Idioma: En Revista: Phys Rev Lett Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Itália
Texto completo
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Análise Espectral Raman / Grafite Tipo de estudo: Prognostic_studies Idioma: En Revista: Phys Rev Lett Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Itália