Quantum phases in a doped Mott insulator on the Shastry-Sutherland lattice
arXiv:cond-mat/0702118 · doi:10.1103/PhysRevLett.99.227003
Abstract
We propose the projected BCS wave function as the ground state for the doped Mott insulator SrCu2(BO3)2 on the Shastry-Sutherland lattice. At half filling this wave function yields the exact ground state. Adding mobile charge carriers, we find a strong asymmetry between electron and hole doping. Upon electron doping an unusual metal with strong valence bond correlations forms. Hole doped systems are d-wave RVB superconductors in which superconductivity is strongly enhanced by the emergence of inhomogeneous plaquette bond order.
4 pages, 3 figures