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Coupling quantum spin ice to matter on the centered pyrochlore lattice

Rajah P. Nutakki1,2,3,4,5,6, Sylvain Capponi7, Ludovic D. C. Jaubert8, and Lode Pollet5,6

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Phys. Rev. B 112, 144437 – Published 23 October, 2025

DOI: https://doi.org/10.1103/xrmm-vr6m

Abstract

The low-energy physics of quantum spin ice is known to support an emergent form of quantum electrodynamics (QED), where magnetic monopoles exist and the fine-structure constant is material dependent. In this article, we show how this QED is modified via a coupling to dynamical matter on the centered pyrochlore lattice, a structure that has recently been synthesized using metal-organic frameworks. Specifically, we study the low-energy properties of the S=1/2 quantum XXZ model on the centered pyrochlore lattice, with a focus on the sign-problem-free region. At fourth order in degenerate perturbation theory, this model hosts a quantum spin liquid distinct from the well-known U(1) quantum spin ice on the pyrochlore because of the presence of dynamical matter in the ground state. Exact diagonalization results are consistent with this quantum spin liquid over an extended region of the ground-state phase diagram, although potential quantum critical points within this region could indicate a richer phase structure. Our work thus expands the physics of quantum spin ice in an experimentally motivated geometry, showing how the emergent QED can be coupled to dynamical matter at zero temperature.

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Phys. Rev. B 112, 144437– Published 23 October, 2025
  • Received 23 May 2025
  • Revised 6 October 2025
  • Accepted 8 October 2025
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