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

May P, Lazzeri M, Venezuela P, Herziger F, Callsen G, Reparaz JS, Hoffmann A, Mauri F, Maultzsch J (2013)


Publication Status: Published

Publication Type: Journal article

Publication year: 2013

Journal

Publisher: AMER PHYSICAL SOC

Book Volume: 87

Journal Issue: 7

DOI: 10.1103/PhysRevB.87.075402

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

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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).

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