Doped Valence Bond Solid and Superconductivity on the Shastry-Sutherland Lattice

Abstract

Motivated by recent experiments on SrCu${}_2$(BO${}_3$)${}_2$, we investigate the ground states of the doped Mott insulator on the Shastry-Sutherland lattice. To provide a unified theoretical framework for both the valence-bond solid state found in undoped SrCu${}_2$(BO${}_3$)${}_2$ and the doped counterpart being pursued in on-going experiments, we analyze the t-J-$V$ model via the bond operator formulation. It is found that novel superconducting states emerge upon doping with their properties crucially depending on the underlying valence bond order. Implications to future experiments are discussed.

10 pages, 6 figures

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• Correlated decay of triplet excitations in the Shastry-Sutherland compound SrCu${}_2$(BO${}_3$)${}_2$
• Emergent Bound States and Impurity Pairs in Chemically Doped Shastry-Sutherland System
• Mott transition and Antiferromagnetic Metal on Shastry-Sutherland Lattice
• Field-Induced Magnetic States in the Metallic Rare-Earth Layered Triangular Antiferromagnet TbAuAl${}_4$Ge${}_2$
• Intermediate valence in single crystalline Yb${}_2$Si${}_2$Al