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Two-dimensional analysis of the double-resonant 2D Raman mode in bilayer graphene.

Authors
  • Herziger, Felix
  • Calandra, Matteo
  • Gava, Paola
  • May, Patrick
  • Lazzeri, Michele
  • Mauri, Francesco
  • Maultzsch, Janina
Type
Published Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publication Date
Oct 31, 2014
Volume
113
Issue
18
Pages
187401–187401
Identifiers
PMID: 25396395
Source
Medline
License
Unknown

Abstract

By computing the double-resonant Raman scattering cross section completely from first principles and including the electron-electron interaction at the GW level, we unravel the dominant contributions for the double-resonant 2D mode in bilayer graphene. We show that, in contrast to previous works, the so-called inner processes are dominant and that the 2D-mode line shape is described by three dominant resonances around the K point. We show that the splitting of the transversal optical (TO) phonon branch in the Γ-K direction, as large as 12  cm(-1) in the GW approximation, is of great importance for a thorough description of the 2D-mode line shape. Finally, we present a method to extract the TO phonon splitting and the splitting of the electronic bands from experimental data.

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