Author(s)

J. M. Baranowski, M. Mozdzonek, P. Dabrowski, K. Grodecki, P. Osewski, W. Kozlowski, M. Kopciuszynski, W. Strupinski

Faculty of Physics and Applied Informatics, Department of Solid State Physics, University of Lodz, Lodz, Poland.
Institute of Electronic Materials Technology, Warsaw, Poland.
Institute of Electronic Materials Technology, Warsaw, Poland;Faculty of Physics, University of Warsaw, Warsaw, Poland.
Institute of Physics, M. Curie-Sklodowska University, Lublin, Poland.

The results of optical investigation of hydrogenated epitaxial bilayer graphene are presented. A softening and an increase of the intensity of the in-plane anti-symmetric phonon mode are observed at 0.2eV. It is suggested that they both originate from coupling of the optically active phonon mode to virtual electronic transitions, which is related to the band structure of bilayer graphene and leads to the “charged phonon” effect. In addition, it is noted that optically active phonon peaks have pronounced Fano shapelines. It is argued that the Fano shapeline is attributed to the interaction of the phonon mode with a continuum of electronic transitions in valence bands of hydrogenated bilayer graphene.

Epitaxial Graphene; Fano Resonance; Phonons

M. Baranowski, J. , Mozdzonek, M. , Dabrowski, P. , Grodecki, K. , Osewski, P. , Kozlowski, W. , Kopciuszynski, M. and Strupinski, W. (2013) Observation of Electron-Phonon Couplings and Fano Re-sonances in Epitaxial Bilayer Graphene. Graphene, 2, 115-120. doi: 10.4236/graphene.2013.24017.