期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.156801
关键词
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资金
- National Science Foundation at Case Western Reserve [DMR-0907477, DMR-1106225]
- National Science Foundation at Columbia [CHE- 0641523]
- NYSTAR
- European FP7 Marie Curie Project [PIEF-GA-2009-251904]
- U.S. DOE [DE-AC02-98CH10886]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0907477] Funding Source: National Science Foundation
The in-plane optical phonons around 200 meV in few-layer graphene are investigated utilizing infrared absorption spectroscopy. The phonon spectra exhibit unusual asymmetric features characteristic of Fano resonances, which depend critically on the layer thickness and stacking order of the sample. The phonon intensities in samples with rhombohedral (ABC) stacking are significantly higher than those with Bernal (AB) stacking. These observations reflect the strong coupling between phonons and interband electronic transitions in these systems and the distinctive variation in the joint density of electronic states in samples of differing thickness and stacking order.
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