Abstract
We investigate the phase diagram of the two-dimensional t-J model using a recently developed Green's function Monte Carlo method for lattice fermions. We use the technique to calculate exact ground-state energies of the model on large lattices. In contrast to many previous studies, we find the model phase separates for all values of . In particular, it is unstable at the hole dopings and interaction strengths at which the model was thought to describe the cuprate superconductors.
- Received 10 September 1996
DOI:https://doi.org/10.1103/PhysRevLett.78.4609
©1997 American Physical Society