标题： 三重态激子对中由反称交换介导的自旋依赖荧光 显示英文标题

标题： Spin dependent fluorescence mediated by anti-symmetric exchange in triplet exciton pairs

摘要： 单线态裂变和三重态-三重态湮灭（TTA）是与自旋相关的现象，对光电技术至关重要。 在共轭三重态对分离过程中自旋种群的动力学对于控制裂变和TTA速率至关重要。 我们表明，Dzyaloshinskii-Moriya相互作用（DMI）会在自旋流形之间引起能级交叉，影响晶体裂变半导体中的自旋种群和TTA速率。 通过研究磁场所对齐于精细结构张量的三重态激子对的自旋依赖荧光，我们隔离了DMI的影响，因为三重态波函数不受磁场影响。 我们的结果表明，DMI引入了由自旋守恒禁止的额外TTA路径，解释了观测到的光学检测磁共振信号随磁场变化的演化。 这项研究突显了DMI对三重态激子光学性质的重要影响，推进了我们对这些系统中自旋动力学的理解。 显示英文摘要

摘要： Singlet fission and triplet-triplet annihilation (TTA) are spin-dependent phenomena critical to optoelectronics. The dynamics of spin populations during geminate triplet pair separation are crucial for controlling fission and TTA rates. We show that the Dzyaloshinskii-Moriya interaction (DMI) induces level crossings between spin manifolds, affecting spin populations and TTA rates in crystalline fission semiconductors. By investigating spin-dependent fluorescence in a triplet exciton pair with the magnetic field aligned along the fine structure tensor, we isolate the effect of DMI, as the triplet wavefunctions remain unaffected by the field. Our results reveal that DMI introduces additional TTA pathways that are forbidden by spin conservation, explaining the observed evolution of optically detected magnetic resonance signals with varying magnetic field. This study highlights the significant impact of DMI on the optical properties of triplet excitons, advancing our understanding of spin dynamics in these systems.