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

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

2007-07-10

arxiv.org/abs/0707.1392v2

Phys. Rev. B 77, 104507 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 6 figures

Scientific paper

10.1103/PhysRevB.77.104507

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.

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