Quantum strings in quantum spin ice
Yuan Wan, Oleg Tchernyshyov
TL;DR
This paper investigates how quantum fluctuations affect monopole confinement in quantum spin ice under a magnetic field, revealing a transition from string confinement to monopole deconfinement with experimental implications.
Contribution
It introduces a detailed analysis of quantum string excitations and monopole deconfinement in quantum spin ice, connecting theoretical predictions with neutron scattering experiments.
Findings
Quantum strings with monopoles appear at weak fluctuations.
Strong fluctuations lead to monopole deconfinement.
Results align with recent neutron scattering data.
Abstract
We study quantum spin ice in an external magnetic field applied along a direction. When quantum spin fluctuations are weak, elementary excitations are quantum strings with monopoles at their ends manifested as multiple spin-wave branches in the dynamical structure factor. Strong quantum fluctuations make the string tension negative and give rise to the deconfinement of monopoles. We discuss our results in the light of recent neutron scattering experiments in
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