Hot carrier cooling by acoustic phonons in epitaxial graphene by ultrafast pump-probe spectroscopy

被引：17
|
作者：
Sun, Dong [1 ]
Divin, Charles [1 ]
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, 2200 Bonisteel Blvd, Ann Arbor, MI 48109 USA
[2] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
来源：
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 4 | 2011年 / 8卷 / 04期
基金：
美国国家科学基金会;
关键词：
graphene; acoustic phonons; hot carrier cooling; pump-probe spectroscopy;
D O I：
10.1002/pssc.201001134
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We report the application nondegenerate ultrafast mid-infrared spectroscopy to investigate the acoustic phonon cooling process in epitaxial graphene. We show that the power-dependent experimental results match theoretical predictions of the low temperature acoustic cooling process. The hot phonon effect in acoustic phonon cooling is observed experimentally, and a deformation potential of 30 eV can be determined from fitting the data. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
引用
收藏
页码：1194 / 1197
页数：4
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