title: Hot phonon dynamics in graphene.
abstract: 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.
authors.affiliation: The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. swwu@fudan.edu.cn
authors.forename: Shiwei
authors.initials: S
authors.lastname: Wu
authors.forename: Wei-Tao
authors.initials: WT
authors.lastname: Liu
authors.forename: Xiaogan
authors.initials: X
authors.lastname: Liang
authors.forename: P James
authors.initials: PJ
authors.lastname: Schuck
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Y Ron
authors.initials: YR
authors.lastname: Shen
authors.forename: Miquel
authors.initials: M
authors.lastname: Salmeron