279 citations · 519 across the 12 of their papers we have counts for
5 papers · 1 filter
The Resonating-Valence-Bond Ground State of Li Nanoclusters
D. Nissenbaum, L. Spanu, C. Attaccalite +2
We have performed Diffusion Quantum Monte Carlo simulations of Li clusters showing that Resonating-Valence-Bond (RVB) pairing correlations between electrons provide a substantial c…
Magnetism and superconductivity in the model
Leonardo Spanu, Massimo Lugas, Federico Becca +1
We present a systematic study of the phase diagram of the model by using the Green's function Monte Carlo (GFMC) technique, implemented within the fixed-node (FN…
Finite compressibility in the low-doping region of the two-dimensional model
Massimo Lugas, Leonardo Spanu, Federico Becca +1
We revisit the important issue of charge fluctuations in the two-dimensional model by using an improved variational method based on a wave function that contains both the a…
Theoretical constraints for the magnetic-dimer transition in two-dimensional spin models
Leonardo Spanu, Federico Becca, Sandro Sorella
From general arguments, that are valid for spin models with sufficiently short-range interactions, we derive strong constraints on the excitation spectrum across a continuous phase…
Weakly frustrated two-dimensional Heisenberg antiferromagnets: thermodynamic properties from a non-perturbative approach
Leonardo Spanu, Alberto Parola
We analyze the thermodynamic properties of the spin-S two-dimensional quantum Heisenberg antiferromagnet on a square lattice with nearest and next-nearest neighbor couplings in the…