光电流
凝聚态物理
异质结
材料科学
石墨烯
之字形的
铁磁性
反铁磁性
磁电阻
自旋(空气动力学)
石墨
光电子学
纳米技术
物理
磁场
几何学
热力学
量子力学
数学
作者
Ying Li,Zhiyuan Ma,Xiaojing Song,Zhi Yang,Li-Chun Xu,Ruiping Liu,Xiuyan Li,Xuguang Liu,Dianyin Hu
标识
DOI:10.1016/j.commatsci.2017.04.021
摘要
Using density functional theory and non-equilibrium Green’s function method, we designed several zigzag graphene-graphyne nanoribbon heterojunction devices and investigated their spin-dependent transport and optoelectronic properties. Our results show that the heterojunctions have outstanding giant magnetoresistance (GMR) effect. The GMR value is as high as 106%. According to the symmetry and connection way, for the ferromagnetic states the heterojunctions may produce two spin currents and exhibit significant rectification behaviors. Furthermore, spin-polarized photocurrents can be generated by irradiating the devices with infrared, visible or ultraviolet light. More importantly, in these heterojunctions we found that the behavior of the spin-up (spin-down) photocurrent for the ferromagnetic state is similar to that of the spin-down (spin-up) photocurrent for the antiferromagnetic state. This novel effect provides an efficient way to control the spin transport in the systems.
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