Diversity of ultrafast hot-carrier-induced dynamics and striking sub-femtosecond hot-carrier scattering times in graphene

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	Diversity of ultrafast hot-carrier-induced dynamics and striking sub-femtosecond hot-carrier scattering times in graphene
	K. Chen; H. H. Li; L. P. Ma; W. C. Ren; T. F. Chung; H. M. Cheng; Y. P. Chen; T. S. Lai
	2014
发表期刊	Carbon
ISSN	0008-6223
卷号	72 页码:402-409
摘要	We study ultrafast dynamics in graphene grown by chemical vapor deposition, which presents a positive peak followed by a negative slow recovery process, and is different from the fully positive or negative dynamics reported. We discuss the diversity of ultrafast dynamics. A dynamic model of differential optical conductivity is developed to simulate ultrafast dynamics. It is found that the diversity of ultrafast dynamics originates from multiple parameter dependence. The appearance of ultrafast dynamics is mainly determined by the position of probed level with respect to static Fermi energy and/or momentum scattering time. The dynamic model is used to best fit the observed ultrafast dynamics to retrieve dynamic time constants. The thermalizing and cooling times of optical phonons are found consistent with the reported values, but a striking sub-femtosecond momentum scattering time and a sub-picosecond time of electron-hole recombination are obtained. The sub-femtosecond scattering time is much shorter than several to a few hundred femtoseconds accepted currently. (C) 2014 Elsevier Ltd. All rights reserved.
部门归属	[chen, ke ; li, huihui ; lai, tianshu] sun yat sen univ, sch phys & engn, state key lab optoelect mat & technol, guangzhou 510275, guangdong, peoples r china. [ma, lai-peng ; ren, wencai ; cheng, hui-ming] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [chung, ting-fung ; chen, yong p.] purdue univ, dept phys, w lafayette, in 47907 usa. ; lai, ts (reprint author), sun yat sen univ, sch phys & engn, state key lab optoelect mat & technol, guangzhou 510275, guangdong, peoples r china. ; stslts@mail.sysu.edu.cn
关键词	Transient Absorption Microscopy Terahertz-probe Spectroscopy Epitaxial Graphene
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72829
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	K. Chen,H. H. Li,L. P. Ma,et al. Diversity of ultrafast hot-carrier-induced dynamics and striking sub-femtosecond hot-carrier scattering times in graphene[J]. Carbon,2014,72:402-409.
APA	K. Chen.,H. H. Li.,L. P. Ma.,W. C. Ren.,T. F. Chung.,...&T. S. Lai.(2014).Diversity of ultrafast hot-carrier-induced dynamics and striking sub-femtosecond hot-carrier scattering times in graphene.Carbon,72,402-409.
MLA	K. Chen,et al."Diversity of ultrafast hot-carrier-induced dynamics and striking sub-femtosecond hot-carrier scattering times in graphene".Carbon 72(2014):402-409.