The Shastry-Sutherland model is an effective model of the layered material ${\mathrm{SrCu}}_2({\mathrm{BO}}_3{)}_2$, which exhibits an extremely rich phase diagram as a function of pressure and magnetic field. Motivated by the recent controversy regarding its phase diagram at zero magnetic field, we perform large-scale simulations based on infinite projected entangled-pair states, a two-dimensional tensor network Ansatz to represent the ground state directly in the thermodynamic limit. By employing the latest optimization techniques, we obtain variational states with lower energy than previous results obtained from other methods. Using systematic extrapolations to the exact infinite bond dimension limit, our simulations reveal a narrow quantum spin liquid phase between the plaquette and antiferromagnetic phases in the range $0.785(5)\le J^{\prime }/J\le 0.82(1)$.

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• Frustrated magnetism
• Quantum spin liquid
• Projected entangled pair states
• Tensor network methods
• Variational approach