Correlated sampling in quantum Monte Carlo: a route to forces

Details Correlated sampling in quantum Monte Carlo: a route to forces Correlated sampling in quantum Monte Carlo: a route to forces

1999-11-20

arxiv.org/abs/cond-mat/9911326v1

Physics

Condensed Matter

5 pages, 2 postscript figures

Scientific paper

10.1103/PhysRevB.61.R16291

In order to find the equilibrium geometries of molecules and solids and to perform ab initio molecular dynamics, it is necessary to calculate the forces on the nuclei. We present a correlated sampling method to efficiently calculate numerical forces and potential energy surfaces in diffusion Monte Carlo. It employs a novel coordinate transformation, earlier used in variational Monte Carlo, to greatly reduce the statistical error. Results are presented for first-row diatomic molecules.

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