Signature of the two-dimensional phonon dispersion in graphene probed by double-resonant Raman scattering

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): May P, Lazzeri M, Venezuela P, Herziger F, Callsen G, Reparaz JS, Hoffmann A, Mauri F, Maultzsch J
Zeitschrift: Physical Review B
Verlag: AMER PHYSICAL SOC
Jahr der Veröffentlichung: 2013
Band: 87
Heftnummer: 7
ISSN: 1098-0121


Abstract


The contributions of the two-dimensional phonon dispersion to the double-resonant Raman scattering process in graphene is determined from the line shape of the two-phonon combination mode around 2450 cm(-1). This mode is usually referred to as G* or D + D ''. By combining Raman experiments with excitation energies up to 2.8 eV and a full two-dimensional calculation of the double-resonant Raman process based on fourth-order perturbation, we can describe in detail the composition of this two-phonon mode and explain the asymmetry on the high-frequency side. The asymmetry directly reflects phonon contributions with wave vectors away from the high-symmetry lines in the Brillouin zone. The main peak of this mode originates from the K Gamma high-symmetry line highlighting and supporting two important findings: first, the existence of so-called inner processes and, second, the dominant contribution along the high-symmetry line. DOI: 10.1103/PhysRevB.87.075402



FAU-Autoren / FAU-Herausgeber

Maultzsch, Janina Prof. Dr.
Lehrstuhl für Experimentalphysik


Autor(en) der externen Einrichtung(en)
Fluminense Federal University / Universidade Federal Fluminense (UFF)
Technische Universität Berlin
University of Paris 6 - Pierre et Marie Curie / Université Paris VI Pierre et Marie Curie (UPMC)


Zitierweisen

APA:
May, P., Lazzeri, M., Venezuela, P., Herziger, F., Callsen, G., Reparaz, J.S.,... Maultzsch, J. (2013). Signature of the two-dimensional phonon dispersion in graphene probed by double-resonant Raman scattering. Physical Review B, 87(7). https://dx.doi.org/10.1103/PhysRevB.87.075402

MLA:
May, Patrick, et al. "Signature of the two-dimensional phonon dispersion in graphene probed by double-resonant Raman scattering." Physical Review B 87.7 (2013).

BibTeX: 

Zuletzt aktualisiert 2018-08-08 um 10:38