Direct measurement of the magnetic photon excitations in the Quantum Spin Ice Pr2Hf2O7
The Quantum Spin Ice (QSI) state, where the two-in-two-out configurations formed by the Ising variables are allowed to tunnel among themselves, is realised in Pr2Hf2O7 based on our last measurements on IN5 (Nature Physics, 14, 711-715 (2018)). The quantum field theory (quantum electrodynamics) that was used to compare with our data, predicts another distinctive feature for this ground state: our energy-integrated quasi-elastic signal from IN5 should be made of dispersive excitations that play the role of emergent photons (Phys. Rev. B, 86, 075154 (2012)). We propose to measure directly these gapless low-energy excitations, whose bandwidth is predicted to be within 0.01 meV according to our estimate of the speed of the emergent photon based on our last IN5 data.
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Romain Sibille; FENNELL Tom; FOUQUET Peter and POREE Victor. (2019). Direct measurement of the magnetic photon excitations in the Quantum Spin Ice Pr2Hf2O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-726
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