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Effect of optical pumping on the momentum relaxation time of graphene in the terahertz range |
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| Authors: | Zuo Zhi-Gao Wang Ping Ling Fu-Ri Liu Jin-Song and Yao Jian-Quan |
| Institution: | [1]Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China [2]School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China [3]College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China |
| 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 |
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