Superconductivity in the two-dimensional t-J model

Details Superconductivity in the two-dimensional t-J model Superconductivity in the two-dimensional t-J model

2001-10-22

arxiv.org/abs/cond-mat/0110460v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.88.117002

Using computational techniques, it is shown that pairing is a robust property of hole doped antiferromagnetic (AF) insulators. In one dimension (1D) 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 (SC) long-range order in this case. However, in two dimensions (2D) it is argued -- and numerically confirmed using several techniques, especially quantum Monte Carlo (QMC) -- that quantum fluctuations are not strong enough to suppress superconductivity.

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