Prof. Rex Godby - The GW approach to spectral, ground-state and transport properties
25 Oct 2011
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​The GW approximation is the first-order term in an expansion of the electronic self-energy operator  in powers of the dynamically screened electron-electron interaction, W. From , the one-particle Green's function G may be calculated, from which various spectral and ground-state properties of electrons in matter are available. For transport properties or the optical absorption spectrum, the two-electron Green's function is required, which may also be formulated at the same level of approximation as GW. Key differences between GW-type theories and density-functional theory (in its ground-state and excited-state formulations) will be discussed, and the use of GW approaches to overcome certain limitations of the usual DFT functionals mentioned.​

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