Strain tunable excitonic optical properties in monolayer Ga_(2)O_(3)  

作　　者：Hao-Lei Cui Zhen Quan Shu-Dong Wang 崔浩磊;权真;王舒东(School of Physical Science and Technology,Inner Mongolia University,Hohhot 010021,China)

机构地区：[1]School of Physical Science and Technology,Inner Mongolia University,Hohhot 010021,China

出　　处：《Chinese Physics B》2024年第10期366-370,共5页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.12064032).

摘　　要：Two-dimensional(2D)Ga_(2)O_(3)has been confirmed to be a stable structure with five atomic layer thickness configuration.In this work,we study the quasi-particle electronic band structures and then access the excitonic optical properties through solving the Bethe-Salpeter equation(BSE).The results reveal that the exciton dominates the optical absorption in the visible light region with the binding energy as large as~1.0 eV,which is highly stable at room temperature.Importantly,both the dominant absorption P_(1)and P_(2)peaks are optically bright without dark exciton between them,and thus is favorable for luminescence process.The calculated radiative lifetime of the lowest-energy exciton is 2.0×10^(-11)s at 0 K.Furthermore,the radiative lifetime under+4%tensile strain is one order of magnitude shorter than that of the strainfree case,while it is less insensitive under the compressive strain.Our findings set the stage for future theoretical and experimental investigation on monolayer Ga_(2)O_(3).

关 键 词：EXCITONS radiative lifetime Ga_(2)O_(3) 

分 类 号：O469[理学—凝聚态物理]