Quantum spin superfluid from Bose-Einstein condensation of spinons in pyrochlore spin ice

Abstract

Quantum spin ice in pyrochlore lattice exemplifies three dimensional frustrated spin systems.In existing studies, Bose-Einstein condensation of bosonic spinons gives rise to magnetically ordered ground state.A truly liquid quantum spin superfluid state that manifests a deconfined Higgs condensate of spinons is demonstrated.This state is shown to occur in the fully antiferromagnetic case of the non-Kramers quantum spin ice with a fluctuations-induced first-order quantum phase transition from the U (1) spin liquid to the spin superfluid.The spin superfluid density jump is obtained analytically.arXiv:1801.01995v1 [cond-mat.str-el]