Yuan Wan, Oleg Tchernyshyov
We study quantum spin ice in an external magnetic field applied along a
$<100>$ 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 $\mathrm{Yb_2Ti_2O_7}$
View original:
http://arxiv.org/abs/1201.5314
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