Two-dimensional t-J model at moderate doping
نویسندگان
چکیده
منابع مشابه
Superconductivity in the Two-Dimensional t-J Model at Low Hole Doping
By combining a generalized Lanczos scheme with the variational Monte Carlo method we can optimize the shortand long-range properties of the groundstate separately. This allows us to measure the long-range order of the groundstate of the t-J model as a function of the coupling constant J/t, and identify a region of finite d-wave superconducting long-range order. With a lattice size of 50 sites w...
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Using computational techniques, it is shown that pairing is a robust property of hole-doped antiferromagnetic insulators. In one dimension and for two-leg ladder systems, a BCS-like variational wave function with long-bond spin singlets and a Jastrow factor provides an accurate representation of the ground state of the t-J model, even though strong quantum fluctuations destroy the off-diagonal ...
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We investigate the effects of the next-nearest-neighbor (t') and the third-nearest-neighbor (t") hopping terms on superconductivity correlation in the 2D hole-doped extended t-J model based on the variational Monte Carlo, mean-field calculation and exact diagonalization method. Despite the diversity of the methods employed, the results all point to a consistent conclusion: While the d-wave supe...
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We study oneand two-hole properties of the t-J model at half-filling on the square lattice using series expansion methods at T50. The dispersion curve for one-hole excitations is calculated and found to be qualitatively similar to that obtained by other methods, but the bandwidth for small t/J is some 20% larger than given previously. We also obtain the binding energy and dispersion relation fo...
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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...
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ژورنال
عنوان ژورنال: The European Physical Journal B - Condensed Matter
سال: 2003
ISSN: 1434-6028,1434-6036
DOI: 10.1140/epjb/e2003-00090-x