Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-06-29
Phys. Rev. B 80, 094529 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 12 figures, as published
Scientific paper
10.1103/PhysRevB.80.094529
We compute the ground-state fidelity and various correlations to gauge the competition between different orders in two-dimensional t-J-type models. Using exact numerical diagonalization techniques, these quantities are examined for (i) the plain t-J and t-t'-J models, (ii) for the t-J model perturbed by infinite-range d-wave or extended-s-wave superconductivity inducing terms, and (iii) the t-J model, plain and with a d-wave perturbation, in the presence of non-magnetic quenched disorder. Various properties at low hole doping are contrasted with those at low electron filling. In the clean case, our results are consistent with previous work that concluded that the plain t-J model supports d-wave superconductivity. As a consequence of the strong correlations present in the low hole doping regime, we find that the magnitude of the d-wave condensate occupation is small even in the presence of large d-wave superconductivity inducing terms. In the dirty case, we show the robustness of the ground state in the strongly correlated regime against disorder.
Haas Stephan
Rigol Marcos
Shastry Sriram B.
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