Breit-Wigner-Fano line shapes in Raman spectra of graphene
Eddwi H. HasdeoDepartment of Physics, Tohoku University, Sendai 980-8578, JapanAhmad R. T. NugrahaDepartment of Physics, Tohoku University, Sendai 980-8578, JapanM. S. DresselhausDepartment of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4037, USARiichiro SaitoDepartment of Physics, Tohoku University, Sendai 980-8578, Japan
2014en
ABI
Аннотация
Excitation of electron-hole pairs in the vicinity of the Dirac cone by the Coulomb interaction gives rise to an asymmetric Breit-Wigner-Fano line shape in the phonon Raman spectra in graphene. This asymmetric line shape appears due to the interference effect between the phonon spectra and the electron-hole pair excitation spectra. The calculated Breit-Wigner-Fano asymmetric factor $1/{q}_{\mathrm{BWF}}$ as a function of the Fermi energy shows a V-shaped curve with a minimum value at the charge neutrality point and gives good agreement with the experimental results.
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