GW approximation

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The GW approximation (GWA) is an approximation made in order to calculate the self-energy of a many-body system. The approximation is that the expansion of the self-energy Σ in terms of the single particle Green function G and the screened interaction W

$\Sigma = GW + GWGWG + \cdots$

can be truncated after the first term:

$\Sigma \approx G W$

[edit] Software supporting the GW approximation

Abinit

[edit] References

L. Hedin, Phys. Rev. 139, A796 (1965).
W.G. Aulbur, L. Jönsson and J.W. Wilkins, Solid State Physics 54, 1 (2000) full version in postscript (7,3MB).
F. Aryasetiawan, O. Gunnarsson, arXiv:cond-mat/9712013v1.