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

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

中国物理B ›› 2013, Vol. 22 ›› Issue (9): 97304-097304.doi: 10.1088/1674-1056/22/9/097304

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

左志高^{a b}, 王平^{a b}, 凌福日^b, 刘劲松^a, 姚建铨^{a c}

a Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China;
b School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China;
c College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China

收稿日期:2012-11-13 修回日期:2013-04-16 出版日期:2013-07-26 发布日期:2013-07-26
基金资助:
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).

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

Zuo Zhi-Gao (左志高)^{a b}, Wang Ping (王平)^{a b}, Ling Fu-Ri (凌福日)^b, Liu Jin-Song (刘劲松)^a, Yao Jian-Quan (姚建铨)^{a c}

a Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China;
b School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China;
c College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China

Received:2012-11-13 Revised:2013-04-16 Online:2013-07-26 Published:2013-07-26
Contact: Ling Fu-Ri E-mail:lingfuri@163.com
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: graphene, momentum relaxation time, optical pumping, terahertz

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.

Key words: graphene, momentum relaxation time, optical pumping, terahertz

中图分类号: (Charge carriers: generation, recombination, lifetime, trapping, mean free paths)

73.50.Gr

78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))

左志高, 王平, 凌福日, 刘劲松, 姚建铨. Effect of optical pumping on the momentum relaxation time of graphene in the terahertz range[J]. 中国物理B, 2013, 22(9): 97304-097304.

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[J]. Chin. Phys. B, 2013, 22(9): 97304-097304.

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

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

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