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We propose a new ansatz for the ground-state wave function of quantummany-body systems on a lattice. The key idea is to cover the lattice withplaquettes and obtain a state whose configurational weights can be optimized bymeans of a Variational Monte Carlo algorithm. Such a scheme applies to anydimension, without any "sign" instability. We show results for various twodimensional spin models (including frustrated ones). A detailed comparison withavailable exact results, as well as with variational methods based on differentansatzs is offered. In particular, our numerical estimates are in quite goodagreement with exact ones for unfrustrated systems, and compare favorably toother methods for frustrated ones.

Ground-State Properties of Quantum Many-Body Systems: Entangled-Plaquette States and Variational Monte Carlo