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Hot phonon dynamics in graphene.

Wu, Shiwei; Liu, Wei-Tao; Liang, Xiaogan; Schuck, P James; Wang, Feng; Shen, Y Ron; Salmeron, Miquel.
Nano Lett; 12(11): 5495-9, 2012 Nov 14.
Artigo em Inglês | MEDLINE | ID: mdl-23106146
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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