A single coupled-perturbed Kohn-Sham calculation replaces 6N DFT runs to obtain unbiased VMC forces that are more consistent with the potential energy surface and closer to CCSD(T) reference values than bare VMC forces.
In the following, it is most convenient to consider the tensorBas a vector with a single compound indexB σ µi =B (µiσ) =B I, and the elements ofAin Eq
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Fast Evaluation of Unbiased Atomic Forces in ab initio Variational Monte Carlo via the Lagrangian Technique
A single coupled-perturbed Kohn-Sham calculation replaces 6N DFT runs to obtain unbiased VMC forces that are more consistent with the potential energy surface and closer to CCSD(T) reference values than bare VMC forces.