Green’s-function Monte Carlo study of thet-Jmodel

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Abstract
We show how the Green’s function Monte Carlo method can be used to compute accurately the ground-state energy of two-dimensional t-J model for lattices of large size. This is demonstrated for the case of a single hole, with the aid of suitable initial and guidance functions. Our transient estimates for the ground-state energy of the 4×4 lattice are in remarkable agreement with the exact values; we report results for lattices of significantly larger size than 4×4.