期刊
PHYSICAL REVIEW LETTERS
卷 105, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.227401
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资金
- ONR [N000140610138]
- NSF [CHE-0641523, DMR-0803691]
- NYSTAR
- FENA MARCO Center
- Keck Foundation
- Ministry of Foreign Affairs (Italy)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0803691] Funding Source: National Science Foundation
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.
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