Transient intervalley scattering and impact ionization in GaAs and InSb in high THz field
Received:December 09, 2016  Revised:May 24, 2017  download
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Author NameAffiliationE-mail
GONG Jiao-Li Wuhan National Laboratory for OptoelectronicsSchool of Optical and Electronic Information, Huazhong University of Science and Technology 32757916@qq.com 
LIU Jin-Song School of Optical and Electronic Information, Huazhong University of Science and Technology jsliu4508@vip.sina.com 
ZHANG Man School of Optical and Electronic Information, Huazhong University of Science and Technology  
CHU Zheng School of Optical and Electronic Information, Huazhong University of Science and Technology  
YANG Zhen-Gang School of Optical and Electronic Information, Huazhong University of Science and Technology  
WANG Ke-Jia School of Optical and Electronic Information, Huazhong University of Science and Technology  
YAO Jian-Quan School of Optical and Electronic Information, Huazhong University of Science and Technology  
Abstract:The ensemble Monte Carlo method was used to calculate the time-variation of scattering mechanisms and the carrier nonlinear dynamics evolution of n-doped GaAs and InSb in the high terahertz (THz) field. The time information of the electrons scattering into the side valleys and that of the electrons relaxation back into the original energy valley was directly obtained. The carriers transient increase process was also traced. Meanwhile, it showed that the intervalley scattering is the main mechanism of GaAs, while the impact ionization is a key point for InSb in high THz field. Furthermore, the work discussed the influences of the two mechanisms on related physical quantities: average kinetic energy, average velocity, and material conductivity. It indicates that the two mechanisms lead to nonlinear effects and play inverse roles in the two materials. The response time of impact ionization in InSb is longer than that of intervalley scattering in GaAs. The results have some guiding values in THz modulation field.
keywords:THz wave, ensemble Monte Carlo, intervalley scattering, impact ionization
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Copyright:《Journal of Infrared And Millimeter Waves》