Relationships between Orbital Energies, Optical and Fundamental Gaps, and Exciton Shifts in Approximate Density Functional Theory and Quasiparticle Theory

Chemical Compounds

• Quasiparticle 90%
• Exciton 57%
• Orbital 47%
• Density Functional Theory 35%
• Energy 26%
• Tight Binding Model 10%
• Error 6%
• Amount 3%

Engineering & Materials Science

• Excitons 100%
• Density functional theory 84%
• Excitation energy 71%
• Green's function 16%

Physics & Astronomy

• excitons 44%
• density functional theory 43%
• orbitals 40%
• shift 34%
• functionals 26%
• energy 16%
• excitation 10%
• Green's functions 5%