Effect of lattice distortion on spin admixture and quantum transport in organic devices with spin–orbit coupling  

作　　者：王莹 李丹 孙新英 张惠晴 马晗 李慧欣 任俊峰 王传奎 胡贵超 Ying Wang;Dan Li;Xinying Sun;Huiqing Zhang;Han Ma;Huixin Li;Junfeng Ren;Chuankui Wang;and Guichao Hu(School of Physics and Electronics,Shandong Normal University,Jinan 250358,China)

机构地区：[1]School of Physics and Electronics,Shandong Normal University,Jinan 250358,China

出　　处：《Chinese Physics B》2024年第7期519-527,共9页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11974215,21933002,and 12274264)。

摘　　要：With an extended Su–Schrieffer–Heeger model and Green's function method, the spin–orbit coupling(SOC) effects on spin admixture of electronic states and quantum transport in organic devices are investigated. The role of lattice distortion induced by the strong electron–lattice interaction in organics is clarified in contrast with a uniform chain. The results demonstrate an enhanced SOC effect on the spin admixture of frontier eigenstates by the lattice distortion at a larger SOC,which is explained by the perturbation theory. The quantum transport under the SOC is calculated for both nonmagnetic and ferromagnetic electrodes. A more notable SOC effect on total transmission and current is observed for ferromagnetic electrodes, where spin filtering induced by spin-flipped transmission and suppression of magnetoresistance are obtained.Unlike the spin admixture, a stronger SOC effect on transmission exists for the uniform chain rather than the organic lattices with distortion. The reason is attributed to the modified spin-polarized conducting states in the electrodes by lattice configuration, and hence the spin-flip transmission, instead of the spin admixture of eigenstates. This work is helpful to understand the SOC effect in organic spin valves in the presence of lattice distortion.

关 键 词：organic spintronics spin–orbit coupling spin admixture quantum transport 

分 类 号：O469[理学—凝聚态物理]