Exact kinetic energy enables accurate evaluation of weak interactions by the FDE-vdW method

The Journal of Chemical Physics
Debalina Sinha, Michele Pavanello

Abstract

The correlation energy of interaction is an elusive and sought-after interaction between molecular systems. By partitioning the response function of the system into subsystem contributions, the Frozen Density Embedding (FDE)-vdW method provides a computationally amenable nonlocal correlation functional based on the adiabatic connection fluctuation dissipation theorem applied to subsystem density functional theory. In reproducing potential energy surfaces of weakly interacting dimers, we show that FDE-vdW, either employing semilocal or exact nonadditive kinetic energy functionals, is in quantitative agreement with high-accuracy coupled cluster calculations (overall mean unsigned error of 0.5 kcal/mol). When employing the exact kinetic energy (which we term the Kohn-Sham (KS)-vdW method), the binding energies are generally closer to the benchmark, and the energy surfaces are also smoother.

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Citations

May 14, 2021·Journal of Chemical Theory and Computation·Xuecheng ShaoMichele Pavanello
Nov 19, 2019·The Journal of Physical Chemistry Letters·Wenhui MiMichele Pavanello
Dec 11, 2019·The Journal of Physical Chemistry Letters·Wenhui Mi, Michele Pavanello

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