Why are time-dependent density functional theory excitations in solids equal to band structure energy gaps for semilocal functionals, and how does nonlocal Hartree–Fock-type exchange introduce excitonic effects?

Title
Why are time-dependent density functional theory excitations in solids equal to band structure energy gaps for semilocal functionals, and how does nonlocal Hartree–Fock-type exchange introduce excitonic effects?
Authors
Keywords
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Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 129, Issue 3, Pages 034101
Publisher
AIP Publishing
Online
2008-07-18
DOI
10.1063/1.2953701

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