期刊
NANO LETTERS
卷 12, 期 11, 页码 5495-5499出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl301997r
关键词
Graphene; hot phonons; ultrafast dynamics; time resolved; anti-Stokes Raman
类别
资金
- Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, of the U.S. Department of Energy [DE-AC02-05CH11231]
- NSFC [11104036]
The dynamics of hot phonons in supported, suspended, and gated Monolayer graphene was studied by using time-resolved anti-Stokes Raman spectroscopy. We found that the hot phonon relaxation is dominated by phonon-phonon interaction in graphene, and strongly affected by the interaction between graphene and the substrate. Relaxation via carrier-phonon coupling, known as Landau damping, is ineffective for hot phonons Which are in thermal equilibrium with excited carriers. Our findings provide a basis for better management of energy dissipation in graphene devices.
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