摘要
固体高次谐波被认为是获取桌面式阿秒光源的一种全新手段,如何进一步增强固体高次谐波的效率一直是研究工作者们关注的焦点.为此,本文采用含时密度泛函理论模拟研究了超快强激光与zigzag型石墨烯/氮化硼二维异质结作用产生高次谐波的特性,发现二维异质结中的界面能够增强电子空穴对密度,进而有效提升高次谐波辐射强度.本研究成果为人工调控材料电子结构或特性从而优化增强固体高次谐波提供了新的理论方案.
Solid-state high harmonic generation(HHG),as a novel approach for generating miniaturized attosecond light sources,have consistently been the research focus to enhance the conversion efficiency of high-order harmonics.In this regard,the scheme of artificially designing the materials with peculiar band structure to optimize HHG in solids was studied by using time-dependent density functional theory.The characteristics of high-order harmonics generated by zigzag-type graphene/h-BN two-dimensional heterostructures in ultrafast strong laser fields are primarily discussed.We find that the interface inside the lateral heterostructures leads to the enhanced carrier density,which effectively increase the harmonic intensity.This work thus provides a novel strategy to optimize the HHG in solids.
作者
易子焓
汪子劭
张翔宇
罗凯
吴桐
余超
YI ZiHan;WANG ZiShao;ZHANG XiangYu;LUO Kai;WU Tong;YU Chao(School of Physics,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《中国科学:物理学、力学、天文学》
北大核心
2025年第1期85-92,共8页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家自然科学基金(编号:12174195)
国家重点研发计划(编号:2022YFA1604301)资助项目。
关键词
超快强激光
二维材料
平面异质结
高次谐波辐射
含时密度泛函理论
ultrafast strong laser
two dimensional material
lateral heterostructures
high harmonic generation
time-dependent density functional theory
