Spin relaxation dynamics of radical-pair processes at low magnetic fields
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2022
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| _version_ | 1866929255242268672 |
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| author | Tennahewa, T. H. Hosseinzadeh, S. Atwood, S. I. Popli, H. Malissa, H. Lupton, J. M. Boehme, C. |
| author_facet | Tennahewa, T. H. Hosseinzadeh, S. Atwood, S. I. Popli, H. Malissa, H. Lupton, J. M. Boehme, C. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2207_07086 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Spin relaxation dynamics of radical-pair processes at low magnetic fields Tennahewa, T. H. Hosseinzadeh, S. Atwood, S. I. Popli, H. Malissa, H. Lupton, J. M. Boehme, C. Mesoscale and Nanoscale Physics 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. |
| title | Spin relaxation dynamics of radical-pair processes at low magnetic fields |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2207.07086 |