Strain- and twist-engineered optical absorption of few-layer black phosphorus  

作　　者：Qian Jia XiangHua Kong JingSi Qiao Wei Ji 

机构地区：[1]Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices, Renmin University of China, Beijing 100872, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2016年第9期86-92,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11274380, 11004244 and 91433103);the National Basic Research Program of China (Grant No. 2012CB932704)

摘　　要：Density functional and many-body perturbation theories calculations were carried out to investigate fundamental and optical bandgap, exciton binding energy and optical absorption property of normal and strain- and twist-engineered few-layer black phosphorus （BP）. We found that the fundamental bandgaps of few layer BP can be engineered by layer stacking and in-plane strain, with linear relationships to their associated exciton binding energies. The strain-dependent optical absorption behaviors are also anisotropic that the position of the first absorption peak monotonically blue-shifts as the strain applies to either direction for incident light polarized along the armchair direction, but this is not the case for that along the zigzag direction. Given those striking properties, we proposed two prototype devices for building potentially more balanced light absorbers and light filter passes, which promotes further applications and investigations of BP in nanoelectronics and optoelectronics.功能的密度和许多身体不安理论计算被执行调查基本、光的 bandgap，激子绑定精力和正常和设计紧张、设计扭曲的很少层黑人磷(BP ) 的光吸收性质。我们发现很少层 BP 的基本 bandgaps 能被层叠和在里面飞机紧张设计，到他们的联系激子绑定精力的线性关系地。紧张依赖者光吸收行为也是各向异性的象紧张 monotonically 蓝移动的第一座吸收山峰的位置为事件光适用于任何一个方向，这极化了扶手椅方向，而是这沿着之字形方向为那不是事实。给那些惹人注目的性质，我们为更潜在地造建议了二台原型设备平衡轻吸收器和灯过滤通行证，它在 nanoelectronics 和光电子支持 BP 的进一步的应用和调查。

关 键 词：black phosphorus light absorption strain-engineering exciton binding energy 

分 类 号：O613.62[理学—无机化学]