Schwinger boson symmetric spin liquids of Shastry-Sutherland model

TL;DR

This paper investigates symmetric spin liquid states in the Shastry-Sutherland model using Schwinger boson formalism, identifying a gapped Z2 spin-liquid phase supported by numerical methods.

Contribution

It introduces a symmetric gapped Z2 spin-liquid state in the Shastry-Sutherland model within a specific parameter range, supported by multiple theoretical approaches.

Findings

Identification of a gapped Z2 spin-liquid state

Support from exact diagonalization and spin wave theory

Parameter range for the spin-liquid phase

Abstract

Motivated by recent experimental and numerical evidences of deconfined quantum critical point and quantum spin-liquid states in spin-$1/2$ Heisenberg model on 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 mean-field approximation. The Schwinger boson mean-field picture is partially supported by exact-diagonalization and self-consistent spin wave theory results.