极化子
自旋扩散
自旋(空气动力学)
兴奋剂
杂质
自旋霍尔效应
凝聚态物理
联轴节(管道)
扩散
材料科学
有机半导体
电压
聚合物
化学物理
化学
自旋极化
光电子学
物理
热力学
有机化学
铁磁性
电子
复合材料
冶金
量子力学
作者
Qiuxia Lu,Sun Yin,Teng Gao,Wei Qin,Shijie Xie,Fanyao Qu,Avadh Saxena
标识
DOI:10.1021/acs.jpclett.9b03703
摘要
We develop a spin diffusion theory based on the exchange mechanism among polarons to understand the organic pure spin current. It is demonstrated that the exchange coupling is strong enough to induce spin transport within the organic layer with impurity concentrations higher than 1018 cm-3. By calculating the inverse spin Hall voltage in an organic spin device, we predict that the voltage depends nonmonotonically on the impurity concentration of the organic material. By tuning the doping concentration, one can achieve a maximum inverse spin Hall voltage. Our results not only explain some recent experimental data but also inspire further experimental investigation on pure spin current in organic devices with variable impurity doping.
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