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

• URL: http://arxiv.org/abs/2502.07038v1
• Date: Mon, 10 Feb 2025 21:07:20 GMT
• Title: Spin dependent fluorescence mediated by anti-symmetric exchange in triplet exciton pairs
• Authors: Yan Sun, M. Monteverde, V. Derkach, T. Chaneliere, E. Aldridge, J. E. Anthony, A. D. Chepelianskii,
• Abstract summary: Singlet fission and triplet-triplet annihilation (TTA) are spin-dependent phenomena critical to optoelectronics. We show that the Dzyaloshinskii-Moriya interaction (DMI) induces level crossings between spin manifold, affecting spin populations and TTA rates. This study highlights the significant impact of DMI on the optical properties of triplet excitons, advancing our understanding of spin dynamics in these systems.
• Score: 1.7125499599889853
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• Abstract: 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.

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