TY  - JOUR
AU  - Venanzi, Tommaso
AU  - Graziotto, Lorenzo
AU  - Macheda, Francesco
AU  - Sotgiu, Simone
AU  - Ouaj, Taoufiq
AU  - Stellino, Elena
AU  - Fasolato, Claudia
AU  - Postorino, Paolo
AU  - Mišeikis, Vaidotas
AU  - Metzelaars, Marvin
AU  - Kögerler, Paul
AU  - Beschoten, Bernd
AU  - Coletti, Camilla
AU  - Roddaro, Stefano
AU  - Calandra, Matteo
AU  - Ortolani, Michele
AU  - Stampfer, Christoph
AU  - Mauri, Francesco
AU  - Baldassarre, Leonetta
TI  - Probing Enhanced Electron-Phonon Coupling in Graphene by Infrared Resonance Raman Spectroscopy
JO  - Physical review letters
VL  - 130
IS  - 25
SN  - 0031-9007
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2024-03010
SP  - 256901
PY  - 2023
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - 37418733
UR  - <Go to ISI:>//WOS:001026290400003
DO  - DOI:10.1103/PhysRevLett.130.256901
UR  - https://juser.fz-juelich.de/record/1025621
ER  -