Schwinger boson symmetric spin liquids of Shastry-Sutherland model

Abstract

Motivated by recent experimental and numerical evidence of deconfined quantum critical points and quantum spin liquid states in the spin-$1/2$ Heisenberg model on the Shastry-Sutherland lattice, we studied possible symmetric spin liquid states and their proximate ordered states under Schwinger boson formalism. We found a symmetric gapped ${Z}_{2}$ spin liquid state for intermediate model parameter $0.66<{J}_{1}/{J}_{2}<0.71$ under the mean-field approximation. The Schwinger boson mean-field picture is partially supported by exact-diagonalization and self-consistent spin wave theory results.

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