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] References

  • L. Hedin, Phys. Rev. 139, A796 (1965).
  • W.G. Aulbur, L. Jönsson and J.W. Wilkins, Solid State Physics 54, 1 (2000).
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