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| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.03365 |
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| _version_ | 1866908584523071488 |
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| author | Chowdhury, Rituparno Murto, Petri Panjwani, Naitik A. Sun, Yan Ghosh, Pratyush Boeije, Yorrick Derkach, Vadim Woo, Seung-Je Millington, Oliver Congrave, Daniel G. Fu, Yao Mustafa, Tarig B. E. Monteverde, Miguel Cerdá, Jesús Behrends, Jan Rao, Akshay Beljonne, David Chepelianskii, Alexei Bronstein, Hugo Friend, Richard H. |
| author_facet | Chowdhury, Rituparno Murto, Petri Panjwani, Naitik A. Sun, Yan Ghosh, Pratyush Boeije, Yorrick Derkach, Vadim Woo, Seung-Je Millington, Oliver Congrave, Daniel G. Fu, Yao Mustafa, Tarig B. E. Monteverde, Miguel Cerdá, Jesús Behrends, Jan Rao, Akshay Beljonne, David Chepelianskii, Alexei Bronstein, Hugo Friend, Richard H. |
| contents | Optical control and read-out of the ground state spin structure has been demonstrated for defect states in crystalline semiconductors, including the diamond NV- center, and these are promising systems for quantum technologies. Molecular organic semiconductors offer synthetic control of spin placement, in contrast to current limitations in these crystalline systems. Here we report the discovery of spin-optical addressability in a diradical molecule that comprises two trityl radical groups coupled via a fluorene bridge. We demonstrate the three important properties that enable operation as a spin-photon interface: (i) triplet and singlet spin states show photoluminescence peaked at 640 and 700 nm respectively; this allows easy optical measurement of ground state spin. (ii) the ground state spin exchange is small (~60 μeV) that allows preparation of ground state spin population. This can be achieved by spin-selective excited state intersystem crossing, and we report up to 8% microwave-driven contrast in photoluminescence. (iii) both singlet and triplet manifolds have near-unity photoluminescence quantum yield, which is in contrast to the near-zero quantum yields in prior reports of molecular diradicals. Our results establish these tuneable open-shell organic molecules as a platform to engineer tailor-made spin-optical interfaces. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_03365 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Optical read and write of spin states in organic diradicals Chowdhury, Rituparno Murto, Petri Panjwani, Naitik A. Sun, Yan Ghosh, Pratyush Boeije, Yorrick Derkach, Vadim Woo, Seung-Je Millington, Oliver Congrave, Daniel G. Fu, Yao Mustafa, Tarig B. E. Monteverde, Miguel Cerdá, Jesús Behrends, Jan Rao, Akshay Beljonne, David Chepelianskii, Alexei Bronstein, Hugo Friend, Richard H. Materials Science Quantum Physics Optical control and read-out of the ground state spin structure has been demonstrated for defect states in crystalline semiconductors, including the diamond NV- center, and these are promising systems for quantum technologies. Molecular organic semiconductors offer synthetic control of spin placement, in contrast to current limitations in these crystalline systems. Here we report the discovery of spin-optical addressability in a diradical molecule that comprises two trityl radical groups coupled via a fluorene bridge. We demonstrate the three important properties that enable operation as a spin-photon interface: (i) triplet and singlet spin states show photoluminescence peaked at 640 and 700 nm respectively; this allows easy optical measurement of ground state spin. (ii) the ground state spin exchange is small (~60 μeV) that allows preparation of ground state spin population. This can be achieved by spin-selective excited state intersystem crossing, and we report up to 8% microwave-driven contrast in photoluminescence. (iii) both singlet and triplet manifolds have near-unity photoluminescence quantum yield, which is in contrast to the near-zero quantum yields in prior reports of molecular diradicals. Our results establish these tuneable open-shell organic molecules as a platform to engineer tailor-made spin-optical interfaces. |
| title | Optical read and write of spin states in organic diradicals |
| topic | Materials Science Quantum Physics |
| url | https://arxiv.org/abs/2406.03365 |