Lifetimes of optical phonons in graphene and graphite by time-resolved incoherent anti-Stokes Raman scattering

被引：124

作者：

Kang, Kwangu

Abdula, Daner

Cahill, David G.

Shim, Moonsub

机构：

[1] Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA

[2] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 16期

基金：

美国国家科学基金会;

关键词：

FIELD-EFFECT TRANSISTORS; WALL CARBON NANOTUBES; EXFOLIATED GRAPHENE; LAYER GRAPHENE; SINGLE-LAYER; SPECTROSCOPY; DISSIPATION; RELAXATION; TRANSPORT; DYNAMICS;

D O I：

10.1103/PhysRevB.81.165405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report lifetimes of optical phonons (OPs) in graphene and graphite measured by time-resolved anti-Stokes Raman scattering. Lifetimes in graphite and monolayer graphene are 2.4 and 1.2 ps, respectively. For graphite and graphene with more than five layers, the lifetimes decrease with increasing temperature as similar to 1/T, indicating the dominance of anharmonic processes in the decay of the OP population. The decrease in lifetime with decreasing number of layers suggests an additional decay channel through which excitations in graphene interact directly with lattice vibrations of the a-SiO2 substrate.

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页数：6

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