Absence of hole pairing in a simple t-J model on the Shastry-Sutherland lattice

Details Absence of hole pairing in a simple t-J model on the Shastry-Sutherland lattice Absence of hole pairing in a simple t-J model on the Shastry-Sutherland lattice

2004-03-17

arxiv.org/abs/cond-mat/0403420v2

Phys. Rev. B 69, 180403 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.69.180403

The Shastry-Sutherland model is a two-dimensional frustrated spin model whose ground state is a spin gap state. We study this model doped with one and two holes on a 32-site lattice using exact diagonalization. When t'>0, we find that the diagonal dimer order that exists at half-filling are retained at these moderate doping levels. No other order is found to be favored on doping. The holes are strongly repulsive unless the hopping terms are unrealistically small. Therefore, the existence of a spin gap at half-filling does not guarantee hole-pairing in the present case.

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