单层β_(12)-硼烯双光子性质的理论研究  

Theoretical Studies on Two-photon Absorption in Monolayer β_(12) -borophene

作　　者：吴梦璇 俞联梦 杨光 陈梦平 王琦闻 冯小波[1,2,3] WU Mengxuan;YU Lianmeng;YANG Guang;CHEN Mengping;WANG Qiwen;FENG Xiaobo(Yunnan Normal University,Kunming 650500,China;Yunnan Key Laboratory of Opto-electronic Information Technology,Kunming 650500,China;Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials,Ministry of Education,Yunnan Normal University,Kunming 650500,China)

机构地区：[1]云南师范大学物理与电子信息学院,云南昆明650500 [2]云南省光电信息技术重点实验室,云南昆明650500 [3]可再生能源材料先进技术与制备教育部重点实验室,云南昆明650500 [4]丽江师范高等专科学校,云南丽江674199

出　　处：《云南师范大学学报（自然科学版）》2023年第6期50-53,共4页Journal of Yunnan Normal University:Natural Sciences Edition

基　　金：国家自然科学基金资助项目(12264057)。

摘　　要：利用五带紧束缚理论计算了均匀模型、反演对称模型、反演非对称模型三种不同模型的单层β_(12)-硼烯的电子能带结构,利用光子-电子相互作用的二阶微扰理论计算了单层β_(12)-硼烯在可见光到近红外波段的双光子吸收谱,揭示了外加电场对X、K、M、Λ四个能带接触点附近电子能带和双光子吸收峰的调制作用.结果表明外加电场会带来简并能带的分裂,增强外加电场会使得双光子吸收峰发生蓝移且峰值被抑制;仅在反演非对称模型中M点附近施加正向电场且电场的能量在1.5~2.0 eV范围内时,因为双光子共振跃迁而出现吸收峰增强.The electron band structure of monolayerβ_(12)-borophene was calculated by using the five-band tight binding theory,and the two-photon absorption spectrum of monolayerβ_(12)-borophene in the visible to near-infrared band was calculated by using the second-order perturbation theory of photon-electron interaction,revealing the modulation effect of the applied electric field on the electron band and the two-photon absorption peak near the contact points of the four energy bands of X,K,M andΛ.The results show that the applied electric field will bring the splitting of the degenerate band,and the enhancement of the applied electric field will cause the two-photon absorption peak to be blueshifted and the peak value to be suppressed.Absorption peak enhancement due to two-photon resonance transitions occurs only when a forward electric field is applied near point M in the inversion asymmetric model and the energy of the electric field is in the range of 1.5~2.0 eV.

关 键 词：单层β_(12)-硼烯 紧束缚模型 双光子吸收 

分 类 号：O437[机械工程—光学工程]