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Semiclassical approach to quantum spin ice

Abstract : We propose a semiclassical 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 renormalize the speed of light and split the two transverse photon polarizations at intermediate wave vectors. We calculate the photon velocity and the ground-state energy to first and second order in perturbation theory, respectively. Both are in good agreement with recent numerical simulations. We further compute the classical energy of the vison excitation.
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Submitted on : Tuesday, May 23, 2017 - 4:15:23 PM
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M.P. Kwasigroch, Benoît Douçot, Claudio Castelnovo. Semiclassical approach to quantum spin ice. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2017, 95 (13), pp.134439. ⟨10.1103/PhysRevB.95.134439⟩. ⟨hal-01526897⟩



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