Positive-projection Monte Carlo simulation: A new variational approach to strongly interacting fermion systems

S. B. Fahy and D. R. Hamann
Phys. Rev. Lett. 65, 3437 – Published 31 December 1990
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Abstract

We show that very accurate ground-state energies and correlation functions can be obtained from an approximate, variational form of the widely used auxiliary-field simulation method. It is derived by recasting this method as a diffusion problem, and does not exhibit the poor statistical behavior due to vanishing normalization or ‘‘sign’’ common to exact fermion simulations. We give illustrative results for two-dimensional Hubbard models.

  • Received 4 May 1990

DOI:https://doi.org/10.1103/PhysRevLett.65.3437

©1990 American Physical Society

Authors & Affiliations

S. B. Fahy and D. R. Hamann

  • AT&T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974

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Vol. 65, Iss. 27 — 31 December 1990

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