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Cited by 823

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Fermion Monte Carlo without fixed nodes: A game of life, death, and annihilation in Slater determinant space

Booth, George H., Thom, Alex J. W., Alavi, Ali·2009·The Journal of Chemical Physics
DOI 10.1063/1.3193710
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Abstract

We have developed a new quantum Monte Carlo method for the simulation of correlated many-electron systems in full configuration-interaction (Slater determinant) spaces. The new method is a population dynamics of a set of walkers, and is designed to simulate the underlying imaginary-time Schrödinger equation of the interacting Hamiltonian. The walkers (which carry a positive or negative sign) inhabit Slater determinant space, and evolve according to a simple set of rules which include spawning, death and annihilation processes. We show that this method is capable of converging onto the full configuration-interaction (FCI) energy and wave function of the problem, without any a priori information regarding the nodal structure of the wave function being provided. Walker annihilation is shown to play a key role. The pattern of walker growth exhibits a characteristic plateau once a critical (system-dependent) number of walkers has been reached. At this point, the correlation energy can be measured using two independent methods—a projection formula and a energy shift; agreement between these provides a strong measure of confidence in the accuracy of the computed correlation energies. We have verified the method by performing calculations on systems for which FCI calculations already exist. In addition, we report on a number of new systems, including CO, O2, CH4, and NaH—with FCI spaces ranging from 109 to 1014, whose FCI energies we compute using modest computational resources.

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Authors
Booth, G. H., Thom, A. J. W., & Alavi, A.
Venue
The Journal of Chemical Physics
Publisher
AIP Publishing
Published
2009-08-04
Volume
131
Issue
5
Pages
054106-054106
ISSN
  • 0021-9606 (ISSN-L)
  • 1089-7690
DOI
10.1063/1.3193710
OpenAlex
W1965288006
Cited by
823
References
0
FWCI
7.43
Type
journal article
Language
en
Open access
closed

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