Hot Phonon Dynamics in Graphene
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- 作者：Shiwei Wu ; Wei-Tao Liu ; Xiaogan Liang ; P. James Schuck ; Feng Wang ; Y. Ron Shen ; Miquel Salmeron
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：November 14, 2012
- 年：2012
- 卷：12
- 期：11
- 页码：5495-5499
- 全文大小：339K
- 年卷期：v.12,no.11(November 14, 2012)
- ISSN：1530-6992
文摘
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鈥損honon interaction in graphene, and strongly affected by the interaction between graphene and the substrate. Relaxation via carrier鈥損honon 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.