Effect of optical pumping on the momentum relaxation time of graphene in the terahertz range

doi:10.1088/1674-1056/22/9/097304

Abstract The momentum relaxation time of a photoexcited graphene in the THz frequency range has been studied by using terahertz time domain spectroscopy under optical pumping at room temperature. It is found that the momentum relaxation time of the graphene as a function of the optical pumping intensity exhibits a threshold behavior. The features of the momentum relaxation time as a function of the optical pumping intensity are also investigated. The results are useful for understanding the basic underlying physics of graphene scattering as well as finding the possible applications in carbon-based electronics.

Keywords: graphene momentum relaxation time optical pumping terahertz

Received: 13 November 2012
Revised: 16 April 2013
Accepted manuscript online:

PACS:	73.50.Gr	(Charge carriers: generation, recombination, lifetime, trapping, mean free paths)
	78.20.Ci	(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))

Fund: Project supported by the National Natural Science Foundation of China (Grants Nos. 10974063 and 61177095), the Hubei Natural Science Foundation, China (Grant Nos. 2010CDA001 and 2012FFA074), the Research Foundation of Huazhong University of Science and Technology, China (Grant Nos. 01-09-230904 and 02-16-230008), the PhD Program Foundation of Ministry of Education of China (Grant No. 20100142110042), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. HUST: 2010MS041 and 2011TS001).

Corresponding Authors: Ling Fu-Ri
E-mail: lingfuri@163.com

Cite this article:

Zuo Zhi-Gao (左志高), Wang Ping (王平), Ling Fu-Ri (凌福日), Liu Jin-Song (刘劲松), Yao Jian-Quan (姚建铨) Effect of optical pumping on the momentum relaxation time of graphene in the terahertz range 2013 Chin. Phys. B 22 097304

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Effect of optical pumping on the momentum relaxation time of graphene in the terahertz range

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