论文标题
在低磁场的激进对过程的自旋松弛动力学
Spin relaxation dynamics of radical-pair processes at low magnetic fields
论文作者
论文摘要
We report measurements of room-temperature spin-relaxation times $T_1$ and $T_2$ of charge-carrier spins in a $π$-conjugated polymer thin film under bipolar injection and low ($1\mbox{ mT}\lesssim B_0\lesssim 10\mbox{ mT}$) static magnetic fields, using electrically detected magnetic resonant Hahn-echo和反转恢复脉冲序列。该实验证实了自由基对过程的磁场灵敏性观察结果之间的相关性，其中包括有机半导体中自旋依赖性重组电流与随机的局部超细磁场和外部磁场的随机旋转时间级时的旋转依赖性重组电流。尽管在低场政权中存在自旋晶格弛豫的惊人场依赖性，但由于两者之间的区别在低场处抬高，因此明显的自旋谐波时间保持独立。
We report measurements of room-temperature spin-relaxation times $T_1$ and $T_2$ of charge-carrier spins in a $π$-conjugated polymer thin film under bipolar injection and low ($1\mbox{ mT}\lesssim B_0\lesssim 10\mbox{ mT}$) static magnetic fields, using electrically detected magnetic resonant Hahn-echo and inversion-recovery pulse sequences. The experiments confirm the correlation between the magnetic-field sensitive observables of radical-pair processes, which include both the spin-dependent recombination currents in organic semiconductors and the associated spin-relaxation times when random local hyperfine fields and external magnetic fields compete in magnitude. Whereas a striking field dependence of spin-lattice relaxation exists in the low-field regime, the apparent spin decoherence time remains field independent as the distinction between the two is lifted at low fields.
