Has emergent quantum electrodynamics been observed in a quantum spin ice?
In plain words
Quantum spin ice should host three kinds of emergent particles: photons, electric-like spinons and magnetic monopoles. Cerium pyrochlores such as $\mathrm{Ce_2Zr_2O_7}$ show signs of these, but alternative explanations are not fully excluded.
Precise statement
In $\mathrm{Ce_2Zr_2O_7}$, $\mathrm{Ce_2Sn_2O_7}$ and $\mathrm{Ce_2Hf_2O_7}$ (dipolar-octupolar doublets), establish the $\mathrm{U}(1)$ quantum spin liquid through its distinct signatures: a gapless linearly dispersing transverse photon ($C \sim T^{3}$ well below the photon bandwidth), a spinon continuum, and their predicted spectral weights. An answer is a fit of thermodynamic and neutron data by quantum spin ice theory with independently fixed exchange parameters that excludes classical or disorder-driven alternatives.
What would settle it
Polarized neutron scattering below $0.05\,\mathrm{K}$ resolving the low-energy photon mode and heat capacity showing the $T^3$ term, both matched to quantum Monte Carlo of the fitted XYZ model.
Status in the literature
Unverified note: it names recent work and was partly written without a live literature search; it awaits a check by an editor.
Gao et al. (Nature Physics 2025) reported neutron and thermodynamic evidence for emergent photons and spinons in $\mathrm{Ce_2Zr_2O_7}$, interpreted as a pi-flux quantum spin ice.
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