A directly observable, Zeeman-insensitive nuclear spin coherence in solution
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866912818368872448 |
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| author | Eills, James Singh, Anushka Teimoori, Amir-Mahyar Marco-Rius, Irene Mitchell, Morgan W. Tayler, Michael C. D. |
| author_facet | Eills, James Singh, Anushka Teimoori, Amir-Mahyar Marco-Rius, Irene Mitchell, Morgan W. Tayler, Michael C. D. |
| contents | Clock transitions are well known in atomic and solid-state systems, but are largely unexplored in molecular liquids. Here we demonstrate a clock-like, nuclear-spin avoided crossing in [1--$^{13}$C]-fumarate that supports long-lived and directly observable coherences at ultralow magnetic field: a three-spin transition $|S_0α\rangle \leftrightarrow |T_{+1}β\rangle$ near 400 nT exhibits a shallow crossing with a frequency minimum of 2 Hz. The transition is first-order immune to magnetic field perturbations and displays a lifetime of 25 s, around three times the longest single-spin $T_2^*$. Sensitivity to effective pseudo-fields is also demonstrated, including the internal dipolar field of the sample. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_07614 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A directly observable, Zeeman-insensitive nuclear spin coherence in solution Eills, James Singh, Anushka Teimoori, Amir-Mahyar Marco-Rius, Irene Mitchell, Morgan W. Tayler, Michael C. D. Chemical Physics Quantum Physics Clock transitions are well known in atomic and solid-state systems, but are largely unexplored in molecular liquids. Here we demonstrate a clock-like, nuclear-spin avoided crossing in [1--$^{13}$C]-fumarate that supports long-lived and directly observable coherences at ultralow magnetic field: a three-spin transition $|S_0α\rangle \leftrightarrow |T_{+1}β\rangle$ near 400 nT exhibits a shallow crossing with a frequency minimum of 2 Hz. The transition is first-order immune to magnetic field perturbations and displays a lifetime of 25 s, around three times the longest single-spin $T_2^*$. Sensitivity to effective pseudo-fields is also demonstrated, including the internal dipolar field of the sample. |
| title | A directly observable, Zeeman-insensitive nuclear spin coherence in solution |
| topic | Chemical Physics Quantum Physics |
| url | https://arxiv.org/abs/2601.07614 |