Abstract
By numerically solving the two-dimensional semiconductor Bloch equation,we study the high-order harmonic emission of a monolayer ZnO under the driving of co-rotating two-color circularly polarized laser pulses.By chang-ing the relative phase between the fundamental frequency field and the second one,it is found that the harmonic intensity in the platform region can be significantly modulated.In the higher order,the harmonic intensity can be increased by about one order of magnitude.Through time-frequency analysis,it is demonstrated that the emission trajectory of monolayer ZnO can be controlled by the relative phase,and the harmonic enhancement is caused by the second quantum trajectory with the higher emission probability.In addition,near-circularly polarized harmonics can be generated in the co-rotating two-color circularly polarized fields.With the change of the relative phase,the harmonics in the platform region can be altered from left-handed near-circularly polariza-tion to right-handed one.Our results can obtain high-intensity harmonic radiation with an adjustable ellipticity,which provides an opportunity for syntheses of circularly polarized attosecond pulses.
基金项目
浙江省自然科学基金(Y23A040001)
浙江省自然科学基金(LY21F050001)
国家重点研发计划(2019YFA0307700)
国家自然科学基金(12074145)
国家自然科学基金(11774219)
国家自然科学基金(11975012)
国家自然科学基金(12374029)
国家自然科学基金(12304378)
国家自然科学基金(12204214)
Jilin Provincial Research Foundation for Basic Research,China(20220101003JC)
Foundation of Education Department of Liaoning Province,China(LJKMZ20221435)
National College Students Innovation and Entrepreneurship Training Program(202310350062)
High Performance Computing Center of Jilin University for supercomputer time and the high performance computing cluster Tige()
NETL
NSTL
万方数据