期刊
NANO LETTERS
卷 13, 期 10, 页码 4620-4623出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl401713h
关键词
Graphene; ultrafast spectroscopy; coherent phonon dynamics; adlayer and substrate interactions
类别
资金
- US Office of Naval Research
- US National Science Foundation [DMR-1106225]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1106225] Funding Source: National Science Foundation
We report real-time observation of the interlayer shearing mode, corresponding; to the lateral oscillation of graphene planes, for bi- and few-layer graphene. Using a femtosecond pump-probe technique, we have followed coherent oscillations of this vibrational mode directly in the time domain. The shearing-mode frequency, as expected for an interlayer mode, exhibits a strong and systematic dependence on the number of layers, varying from 1.32 THz for the bulk limit to 0.85 THz for bilayer graphene. We explored the role of interactions with the external environment on this vibrational mode by comparing the response observed for graphene layers supported by different substrates and suspended in free space. No significant frequency shifts were observed.
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