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JOURNAL OF APPLIED PHYSICS
Volume 90, Issue 9, Pages 4494-4497Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1408590
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We have revisited the still unresolved puzzle of the dispersion of the Raman disorder-induced D band as a function of laser excitation photon energy E-L in graphite-like materials. We propose that the D mode is a combination of an optic phonon at the K point in the Brillioun zone and an acoustic phonon whose momentum is determined uniquely by the double resonance condition. The fit of the experimental data with the double-resonance model yields the reduced effective mass of 0.025 m(e) for the electron-hole pairs corresponding to the A(2) transition, in agreement with other experiments. The model can also explain the difference between omega (S) and omega (AS) for D and D* modes, and predicts its dependence on the Raman excitation frequency. (C) 2001 American Institute of Physics.
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