dorsal/arxiv
View SchemaA directly observable, Zeeman-insensitive nuclear spin coherence in solution
| Authors | James Eills, Anushka Singh, Amir-Mahyar Teimoori, Irene Marco-Rius, Morgan W. Mitchell, Michael C. D. Tayler |
|---|---|
| Categories | |
| ArXiv ID | 2601.07614vv1 |
| URL | https://arxiv.org/abs/2601.07614 |
| License | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
Abstract
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 $|S_0\alpha\rangle \leftrightarrow |T_{+1}\beta\rangle$ 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.
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"date_created": "2026-02-17T05:53:11.897000Z",
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"abstract": "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 $|S_0\\alpha\\rangle \\leftrightarrow |T_{+1}\\beta\\rangle$ 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.",
"arxiv_id": "2601.07614",
"authors": [
"James Eills",
"Anushka Singh",
"Amir-Mahyar Teimoori",
"Irene Marco-Rius",
"Morgan W. Mitchell",
"Michael C. D. Tayler"
],
"categories": [
"physics.chem-ph",
"quant-ph"
],
"license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
"title": "A directly observable, Zeeman-insensitive nuclear spin coherence in solution",
"url": "https://arxiv.org/abs/2601.07614",
"version": "v1"
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