Observation of Magnetophonon Resonance of Dirac Fermions in Graphite
Abstract
Coherent coupling of Dirac fermion magnetoexcitons with an optical phonon is observed in graphite as marked magnetic-field dependent splittings and anticrossing behavior of the two coupled modes. The sharp magnetophonon resonance occurs in regions of the graphite sample with properties of superior single-layer graphene having enhanced lifetimes of Dirac fermions. The greatly reduced carrier broadening to values below the graphene electron-phonon coupling constant explains the appearance of sharp resonances that reveal a fundamental interaction of Dirac fermions.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 2010
- DOI:
- 10.1103/PhysRevLett.105.227401
- arXiv:
- arXiv:1008.1206
- Bibcode:
- 2010PhRvL.105v7401Y
- Keywords:
-
- 78.67.Wj;
- 78.30.-j;
- 78.20.Ls;
- Infrared and Raman spectra;
- Magnetooptical effects;
- Condensed Matter - Materials Science;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 5 figures, supplementary material section included