Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-04-23
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 4 figures
Scientific paper
A Fano-like phonon resonance is observed in few-layer (~3) graphene at room temperature using infrared Fourier transform spectroscopy. This Fano resonance is the manifestation of a strong electron-phonon interaction between the discrete in-plane lattice vibrational mode and continuum electronic excitations in graphene. By employing ammonia chemical doping, we have obtained different Fano line shapes ranging from anti-resonance in hole-doped graphene to phonon-dominated in n-type graphene. The Fano resonance shows the strongest interference feature when the Fermi level is located near the Dirac point. The charged phonon exhibits much-enhanced oscillator strength and experiences a continuous red shift in frequency as electron density increases. It is suggested that the phonon couples to different electronic transitions as Fermi level is tuned by chemical doping.
Bao Jiming
Liu Zhihong
Lu Xiaoxiang
Pei Steven
Peng Peng
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