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Double resonant raman scattering in graphite

Thomsen1, Reich

  • 1Institut fur Festkorperphysik, Technische Universitat Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany.

Physical Review Letters
|December 2, 2000
PubMed
Summary
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Double resonant Raman scattering explains the graphite D mode's excitation-energy dependence. This finding resolves a long-standing scientific problem and validates new calculations for the D-mode frequency shift.

Area of Science:

  • Condensed matter physics
  • Materials science
  • Spectroscopy

Background:

  • The excitation-energy dependence of the graphite D mode has been a long-standing puzzle in Raman spectroscopy.
  • Previous attempts to explain this phenomenon have been unsuccessful or invalidated.

Purpose of the Study:

  • To elucidate the underlying mechanism responsible for the graphite D mode's excitation-energy dependence.
  • To resolve a persistent problem in the scientific literature concerning graphite's Raman spectra.

Main Methods:

  • Theoretical calculation of electronic dispersion in graphite.
  • Analysis of double resonant Raman scattering processes.
  • Comparison of calculated D-mode frequency shift with experimental data.

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Main Results:

  • Electronic dispersion in graphite leads to double resonant Raman scattering up to 5 eV excitation energies.
  • This double resonant process is identified as the cause of the D mode's curious excitation-energy dependence.
  • Calculated D-mode frequency shift (60 cm(-1)/eV) shows excellent agreement with experimental values.

Conclusions:

  • The study successfully explains the graphite D mode's excitation-energy dependence through double resonant Raman scattering.
  • The findings resolve a long-standing issue and invalidate alternative explanations.
  • The theoretical model provides accurate predictions for the D-mode frequency shift.