In this 30 minute talk, Prof. John Perdew from Temple University provide a clear and brief account on the Density Functional Theory.
https://ipam.wistia.com/medias/wr250h0loi
In this lecture, Prof. Perdew answers (including other details) following questions:
Why Exc is called as Nature's glue?
In the Kohn-Sham equation, if you set Exc=0, the resulting bond lengths will be too large (about 20% larger than the actual values) and the binding energies will be too low (often zero). This means that the Exc is important to describe the bonding of atoms in the molecules and crystals. That is the reason for calling Exc as Nature's glue.
Why LDA is good?
Ref: Langreth and Perdew 1975; Langreth and Gunnerson 1976
Because LDA satisfies hidden exact constrains valid for any system.
https://ipam.wistia.com/medias/wr250h0loi
In this lecture, Prof. Perdew answers (including other details) following questions:
Why Exc is called as Nature's glue?
In the Kohn-Sham equation, if you set Exc=0, the resulting bond lengths will be too large (about 20% larger than the actual values) and the binding energies will be too low (often zero). This means that the Exc is important to describe the bonding of atoms in the molecules and crystals. That is the reason for calling Exc as Nature's glue.
Why LDA is good?
Ref: Langreth and Perdew 1975; Langreth and Gunnerson 1976
Because LDA satisfies hidden exact constrains valid for any system.
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