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arXiv · 2512.14843

Hearing the light: stray-field noise from the emergent photon in quantum spin ice

Gautam K. Naik·Jonathan N. Hallén·Nishan C. Jayarama·Roderich Moessner·Chris R. Laumann
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Abstract

Decisive experimental confirmation of the $U(1)$ quantum spin liquid phase in quantum spin ice remains an outstanding challenge. In this work, we propose stray-field magnetometry as a direct probe of the emergent photons -- the gapless excitation of the emergent electrodynamics in quantum spin ice. The emergent photons are transverse magnetization waves, which, in a finite sample, form discrete modes governed by one of two sets of natural boundary conditions: ``insulating'' or ``superconducting''. Considering cavity and thin film geometries, we find that the spectrum and spatial structure of the stray magnetic noise provide a sharp qualitative signature of the underlying electrodynamics. The predicted stray-field noise power lies comfortably within the detection range of present-day solid-state defect magnetometry.

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Gautam K. Naik, Jonathan N. Hallén, Nishan C. Jayarama, Roderich Moessner, Chris R. Laumann. 2025-12-16. Hearing the light: stray-field noise from the emergent photon in quantum spin ice. https://doi.org/10.1103/s9bc-jcs9

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