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arXiv:cond-mat/0302356 · The European Physical Journal B

Two-dimensional t-J model at moderate doping

A. Sherman, M. Schreiber

Published Mar 1, 2003• 41 citations
arXivHTMLPDF
DOI
10.1140/epjb/e2003-00090-x

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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 ${t}^{\ensuremath{'}}>0,$ we find that the diagonal dimer order that exists at half-filling is 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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