中国物理B ›› 2016, Vol. 25 ›› Issue (10): 100203-100203.doi: 10.1088/1674-1056/25/10/100203
Jiao-Li Gong(龚姣丽), Jin-Song Liu(刘劲松), Zheng Chu(褚政), Zhen-Gang Yang(杨振刚), Ke-Jia Wang(王可嘉), Jian-Quan Yao(姚建铨)
Jiao-Li Gong(龚姣丽)1,2,3, Jin-Song Liu(刘劲松)1, Zheng Chu(褚政)1, Zhen-Gang Yang(杨振刚)1, Ke-Jia Wang(王可嘉)1, Jian-Quan Yao(姚建铨)1
摘要:
The nonlinear radiation responses of two different n-doped bulk semiconductors: indium antimonide (InSb) and indium arsenide (InAs) in an intense terahertz (THz) field are studied by using the method of ensemble Monte Carlo (EMC) at room temperature. The results show that the radiations of two materials generate about 2-THz periodic regular spectrum distributions under a high field of 100 kV/cm at 1-THz center frequency. The center frequencies are enhanced to about 7 THz in InSb, and only 5 THz in InAs, respectively. The electron valley occupancy and the percentage of new electrons excited by impact ionization are also calculated. We find that the band nonparabolicity and impact ionization promote the generation of nonlinear high frequency radiation, while intervalley scattering has the opposite effect. Moreover, the impact ionization dominates in InSb, while impact ionization and intervalley scattering work together in InAs. These characteristics have potential applications in up-convension of THz wave and THz nonlinear frequency multiplication field.
中图分类号: (Distribution theory and Monte Carlo studies)