Journal Article

FZJ-2024-03010

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Probing Enhanced Electron-Phonon Coupling in Graphene by Infrared Resonance Raman Spectroscopy

Venanzi, T. ; Graziotto, L. ; Macheda, F. ; Sotgiu, S. ; Ouaj, T. ; Stellino, E. ; Fasolato, C. ; Postorino, P. ; Mišeikis, V. ; Metzelaars, M. ; Kögerler, P.RWTH* ; Beschoten, B.FZJ*RWTH* ; Coletti, C. ; Roddaro, S. ; Calandra, M. ; Ortolani, M. ; Stampfer, C.FZJ*RWTH* ; Mauri, F. ; Baldassarre, L. (Corresponding author)

2023
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.130.256901  doi:10.34734/FZJ-2024-03010

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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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA Institut Quanteninformation (PGI-11)
3. JARA-FIT (JARA-FIT)

Research Program(s):

1. 5222 - Exploratory Qubits (POF4-522) (POF4-522)
2. DFG project 390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769) (390534769)
3. GrapheneCore3 - Graphene Flagship Core Project 3 (881603) (881603)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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