Origin of the unusual dependence of Raman D band on excitation wavelength in graphite-like materials

Details Origin of the unusual dependence of Raman D band on excitation wavelength in graphite-like materials Origin of the unusual dependence of Raman D band on excitation wavelength in graphite-like materials

2001-10-19

arxiv.org/abs/cond-mat/0110402v1

Journal of Applied Physics, vol. 90, issue 9, pg 4494 (2001)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 figures in eps format

Scientific paper

10.1063/1.1408590

We have revisited the still unresolved puzzle of the dispersion of the Raman disordered-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 0.025m$_{e}$ 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$^{\star}$ modes, and predicts its dependence on the Raman excitation frequency.

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