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Semi-classical Approach to Quantum Spin Ice

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arxiv 1609.03079 v1 pith:6YIN6CPF submitted 2016-09-10 cond-mat.str-el

M. P. Kwasigroch , B. Douçot , C. Castelnovo This is my paper · ORCID
classification cond-mat.str-el
keywords orderphotonquantumsemi-classicalspinagreementanalyticapproach
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We propose a semi-classical description of the low-energy properties of quantum spin ice in the strong Ising limit. Within the framework of a semiclassical, perturbative Villain expansion, that can be truncated at arbitrary order, we give an analytic and quantitative treatment of the deconfining phase. We find that photon-photon interactions significantly renormalise the speed of light and split the two transverse photon polarisations at intermediate wavevectors. We calculate the photon velocity and the ground state energy to first and second order in perturbation theory, respectively. The former is in good agreement with recent numerical simulations.

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

    cond-mat.str-el 2025-12 conditional novelty 7.0 of 10

    Finite-size emergent-photon modes produce measurable, boundary-condition-dependent stray-field noise: superconducting boundaries give sharp NV-detected spectra, insulating boundaries give none.

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