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Quantum Phase Transition in Coupled Spin Ladders
Luca Capriotti, Federico Becca
The ground state of an array of coupled, spin-half, antiferromagnetic ladders is studied using spin-wave theory, exact diagonalization (up to 36 sites) and quantum Monte Carlo tech…
Superconductivity in the two-dimensional t-J model
S. Sorella, G. B. Martins, F. Becca +4
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,…
Stripes and spin-incommensurabilities are favored by lattice anisotropies
Federico Becca, Luca Capriotti, Sandro Sorella
Structural distortions in cuprate materials give a natural origin for anisotropies in electron properties. We study a modified one-band t-J model in which we allow for different ho…
Resonating Valence Bond Wave Functions for Strongly Frustrated Spin Systems
Luca Capriotti, Federico Becca, Alberto Parola +1
The Resonating Valence Bond (RVB) theory for two-dimensional quantum antiferromagnets is shown to be the correct paradigm for large enough ``quantum frustration''. This scenario, p…
Nagaoka ferromagnetism in the two-dimensional infinite-U Hubbard model
Federico Becca, Sandro Sorella
We present different numerical calculations based on variational quantum Monte Carlo simulations supporting a ferromagnetic ground-state for finite and small hole densities in the…