(英)强THz场下n型GaAs和InSb中瞬态谷间散射和碰撞电离的研究
Received:December 09, 2016  Revised:May 24, 2017  点此下载全文
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Author NameAffiliationE-mail
GONG Jiao-Li School 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  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:运用系宗蒙特卡罗法计算了强THz场作用下,n型掺杂的GaAs和InSb中随时间变化的散射机制以及载流子非线性动力学演变,获取了电子散射至卫星谷并逐渐弛豫回原能谷的时间信息,并追踪描绘了载流子瞬态增加的过程,结果也显示了谷间散射是GaAs中的主要散射机制,而碰撞电离则是InSb中的关键因素。我们更进一步讨论了这两种机制对于相关物理量:平均动能,平均速度,材料的电导率的影响,结果说明这两种机制导致了非线性效应并在两种材料中起到相反的作用,InSb中碰撞电离的响应时间比GaAs中谷间散射的响应时间更长。该研究结果在THz调制领域有一定的指导意义。
中文关键词:THz波,系宗蒙特卡罗,谷间散射,碰撞电离
 
Study of transient intervalley scattering and impact ionization in n-doped GaAs and InSb at high THz field
Abstract:The ensemble Monte Carlo method is used to calculate the time-variation of scattering mechanisms and the carrier nonlinear dynamics evolution of n-doped GaAs and InSb in the high THz field. The time information of the electrons scattering into the side valleys and gradual relaxtion back into the original energy valley is directly obtained, and the carriers transient increase process is traced. It also shows that the intervalley scattering is the main mechanism of GaAs, while impact ionization is a key point for InSb. We further discuss 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》