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Accurate and numerically efficient r$^2$SCAN meta-generalized gradient approximation

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arxiv 2008.03374 v2 pith:ZBJ7WTD3 submitted 2020-08-07 cond-mat.mtrl-sci physics.chem-ph

classification cond-mat.mtrl-sciphysics.chem-ph
keywords functionalscanrscanapproximationexactgradientmeta-generalizednumerical
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The recently proposed rSCAN functional [J. Chem. Phys. 150, 161101 (2019)] is a regularized form of the SCAN functional [Phys. Rev. Lett. 115, 036402 (2015)] that improves SCAN's numerical performance at the expense of breaking constraints known from the exact exchange-correlation functional. We construct a new meta-generalized gradient approximation by restoring exact constraint adherence to rSCAN. The resulting functional maintains rSCAN's numerical performance while restoring the transferable accuracy of SCAN.

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