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

TL;DR

This paper proposes using stray-field magnetometry to directly detect emergent photons in quantum spin ice, providing a practical experimental signature for the elusive $U(1)$ quantum spin liquid phase.

Contribution

It introduces a novel method to observe emergent photons in quantum spin ice via stray magnetic noise, bridging theory and experimental detection.

Findings

Stray-field noise spectrum reveals signatures of emergent photons.

Boundary conditions influence the magnetic noise modes.

Detection is feasible with current solid-state magnetometry technology.

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.