Decoherence Effects of Terahertz Generation in Solids under Two-Color Femtosecond Laser Fields  

作　　者：Qifang Peng Zhaoyang Peng Yue Lang Yalei Zhu Dongwen Zhang Zhihui Lü Zengxiu Zhao 彭齐芳;彭朝阳;郎跃;朱雅蕾;张栋文;吕治辉;赵增秀(Department of Physics,College of Liberal Arts and Sciences,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]Department of Physics,College of Liberal Arts and Sciences,National University of Defense Technology,Changsha 410073,China

出　　处：《Chinese Physics Letters》2022年第5期36-41,共6页中国物理快报（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2019YFA0307704);the National Natural Science Foundation of China(Grant Nos.91850201,U1830206,11974426,11974425,11874425,11774428,and 12074431)。

摘　　要：We theoretically investigate terahertz emission from solid materials pumped by intense two-color femtosecond laser field in the presence of decoherence effects.Quantum-mechanical simulations are based on the length gauge semiconductor Bloch equations describing the optical excitation and decoherence with phenomenological dephasing and depopulation times.Contributions of interband and intraband mechanisms are identified in time domain,and the latter has dominated THz generation in solid-state systems.It is found that dephasing is crucial for enhancing asymmetric intraband current and deduced that solid-state materials with short dephasing time and long depopulation time would be optimal selection for strong-field terahertz generation experiments.

关 键 词：PUMPED FEMTO SOLID 

分 类 号：O441.4[理学—电磁学] TN24[理学—物理]