Ultrafast Relaxation of Excited Dirac Fermions in Epitaxial Graphene Using Optical Differential Transmission Spectroscopy

被引：410
|
作者：
Sun, Dong [1 ]
Wu, Zong-Kwei [1 ]
Divin, Charles [1 ]
Li, Xuebin [2 ]
Berger, Claire [2 ]
de Heer, Walt A. [2 ]
First, Phillip N. [2 ]
Norris, Theodore B. [1 ]
机构：
[1] Univ Michigan, Ctr Ultrafast Opt Sci, Ann Arbor, MI 48109 USA
[2] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 15期
关键词：
D O I：
10.1103/PhysRevLett.101.157402
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate the ultrafast relaxation dynamics of hot Dirac fermionic quasiparticles in multilayer epitaxial graphene using ultrafast optical differential transmission spectroscopy. We observe differential transmission spectra which are well described by interband transitions with no electron-hole interaction. Following the initial thermalization and emission of high-energy phonons, the electron cooling is determined by electron-acoustic phonon scattering, found to occur on the time scale of 1 ps for highly doped layers, and 4-11 ps in undoped layers. The spectra also provide strong evidence for the multilayer structure and doping profile of thermally grown epitaxial graphene on SiC.
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