Effective hamiltonian approach and the lattice fixed node approximation

Details Effective hamiltonian approach and the lattice fixed node approximation Effective hamiltonian approach and the lattice fixed node approximation

2003-10-31

arxiv.org/abs/cond-mat/0310781v2

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, for the proceedings of "The Monte Carlo Method in the Physical Sciences: Celebrating the 50th Anniversary of the Metr

Scientific paper

10.1063/1.1632143

We define a numerical scheme that allows to approximate a given Hamiltonian by an effective one, by requiring several constraints determined by exact properties of generic ''short range'' Hamiltonians. In this way the standard lattice fixed node is also improved as far as the variational energy is concerned. The effective Hamiltonian is defined in terms of a guiding function $\psi_G$ and can be solved exactly by Quantum Monte Carlo methods. We argue that, for reasonable $\psi_G$ and away from phase transitions, the long distance, low energy properties are rather independent on the chosen guiding function, thus allowing to remove the well known problem of standard variational Monte Carlo schemes based only on total energy minimizations, and therefore insensitive to long distance low energy properties.

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