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Bulletin of the American Physical Society

Enhanced superconductivity due to inhomogeneous bond order in a doped Mott insulator

Jun Liu, Jörg Schmalian, Nandini Trivedi

Published Mar 8, 2007• 0 citations
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Quantum Phases in a Doped Mott Insulator on the Shastry-Sutherland Lattice

Jun Liu, Nandini Trivedi, Yongbin Lee +2 more

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 resonating valence bond superconductors in which superconductivity is strongly enhanced by the emergence of spatially varying plaquette bond order.

arXiv:cond-mat/0702118•Physical Review Letters•Nov 30, 2007•23 citations
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 resonating valence bond superconductors in which superconductivity is strongly enhanced by the emergence of spatially varying plaquette bond order.