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Density functionals that recognize covalent, metallic, and weak bonds
Sun, J Xiao, B Fang, Y Haunschild, R Hao, P Ruzsinszky, A Csonka, GI Scuseria, GE Perdew, JP
Sun, J
Xiao, B
Fang, Y
Haunschild, R
Hao, P
Ruzsinszky, A
Csonka, GI
Scuseria, GE
Perdew, JP
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2013-09-04
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10.1103/PhysRevLett.111.106401
Abstract
Computationally efficient semilocal approximations of density functional theory at the level of the local spin density approximation (LSDA) or generalized gradient approximation (GGA) poorly describe weak interactions. We show improved descriptions for weak bonds (without loss of accuracy for strong ones) from a newly developed semilocal meta-GGA (MGGA), by applying it to molecules, surfaces, and solids. We argue that this improvement comes from using the right MGGA dimensionless ingredient to recognize all types of orbital overlap. © 2013 American Physical Society.
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Physical Review Letters
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