Exciton effect on shift current in single-walled boron-nitride nanotubes
Exciton effect on shift current in single-walled boron-nitride nanotubes
复制标题
DOI：
10.1103/physrevb.103.075402
复制
发表时间：
2021-02-01
影响因子：
3.7
通讯作者：
Konabe, Satoru
中科院分区：
文献类型：
--
作者：
Konabe, Satoru
本文利用有效质量理论结合Bethe-Salpeter方程研究了单壁氮化硼纳米管中激子效应对位移电流的影响。我们发现，位移电流增强激子效应相比，自由电子-空穴对和位移电流的方向是由纳米管的手性指数，即使在激子的存在下。我们提供了一个简单的解释，为什么手征指数决定的方向的移位电流从键结构的观点，通过水稻梅勒模型。
In the present paper, we investigate the exciton effect on the shift current in single-walled boron-nitride nanotubes using effective mass theory combined with the Bethe-Salpeter equation to include the exciton effect. We found that the shift current is enhanced by the exciton effect compared to that of free electron-hole pairs and that the direction of the shift current is determined by the chiral index of the nanotube even in the presence of excitons. We provide a simple explanation of why the chiral index determines the direction of the shift current from a bond structure viewpoint via the Rice-Mele model.