Superconductivity in the two-dimensional t-J model.
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 superconducting long-range order in this case. However, in two dimensions it is argued-and numerically confirmed using several techniques, especially quantum Monte Carlo-that quantum fluctuations are not strong enough to suppress superconductivity.
Sorella
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S
Istituto Nazionale per la Fisica della Materia, and SISSA, I-34014 Trieste, Italy.
Martins
G B
GB
Becca
F
F
Gazza
C
C
Capriotti
L
L
Parola
A
A
Dagotto
E
E