Length dependence of rectification in organic co-oligomer spin rectifiers  

作　　者：胡贵超 张朝 李营 任俊峰 王传奎 

机构地区：[1]School of Physics and Electronics, Shandong Normal University

出　　处：《Chinese Physics B》2016年第5期333-338,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11374195);the Natural Science Foundation of Shandong Province,China(Grant No.ZR2014AM017);the Taishan Scholar Project of Shandong Province,China;the Excellent Young Scholars Research Fund of Shandong Normal University,China

摘　　要：The rectification ratio of organic magnetic co-oligomer diodes is investigated theoretically by changing the molecular length. The results reveal two distinct length dependences of the rectification ratio： for a short molecular diode, the chargecurrent rectification changes little with the increase of molecular length, while the spin-current rectification is weakened sharply by the length; for a long molecular diode, both the charge-current and spin-current rectification ratios increase quickly with the length. The two kinds of dependence switch at a specific length accompanied with an inversion of the rectifying direction. The molecular ortibals and spin-resolved transmission analysis indicate that the dominant mechanism of rectification suffers a change at this specific length, that is, from asymmetric shift of molecular eigenlevels to asymmetric spatial localization of wave functions upon the reversal of bias. This work demonstrates a feasible way to control the rectification in organic co-oligomer spin diodes by adjusting the molecular length.The rectification ratio of organic magnetic co-oligomer diodes is investigated theoretically by changing the molecular length. The results reveal two distinct length dependences of the rectification ratio： for a short molecular diode, the chargecurrent rectification changes little with the increase of molecular length, while the spin-current rectification is weakened sharply by the length; for a long molecular diode, both the charge-current and spin-current rectification ratios increase quickly with the length. The two kinds of dependence switch at a specific length accompanied with an inversion of the rectifying direction. The molecular ortibals and spin-resolved transmission analysis indicate that the dominant mechanism of rectification suffers a change at this specific length, that is, from asymmetric shift of molecular eigenlevels to asymmetric spatial localization of wave functions upon the reversal of bias. This work demonstrates a feasible way to control the rectification in organic co-oligomer spin diodes by adjusting the molecular length.

关 键 词：organic spintronics organic ferromagnet RECTIFICATION 

分 类 号：TM461[电气工程—电器]