Abstract
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.
基金项目
National Natural Science Foundation of China(11974215)
National Natural Science Foundation of China(21933002)
National Natural Science Foundation of China(12274264)
NETL
NSTL
万方数据