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cond-mat1997
Anomalous finite size spectrum in the S=1/2 two dimensional Heisenberg model
C. Lavalle, S. Sorella, A. Parola
We study the low energy spectrum of the nearest neighbor Heisenberg model on a square lattice as a function of the total spin S. By quantum Monte Carlo simulation we compute this s…
cond-mat1997
Theory of hole propagation in one dimensional insulators and superconductors
S. Sorella, A. Parola
The dynamical properties of hole motion in an antiferromagnetic background are determined in one dimensional models in zero magnetic field, where spin isotropy holds, as well as in…