title: Quantum strings in quantum spin ice.
abstract: 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 Yb2Ti2O7.
authors.affiliation: Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Massachusetts 21218, USA.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Wan
authors.forename: Oleg
authors.initials: O
authors.lastname: Tchernyshyov