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["Matteo Giantomassi" <Matteo.Giantomassi@uclouvain.be>]

> Dear colleagues,
> I would like to understand better the method which is used calculate
> epsilon(q,G1,G2,w) matrix elements in GW approximation. Could you suggest
> an
> article which helps to understand the screening.F90 subroutine?
> Thank you,
> Andrey TITOV.
>

Dear Andrey

For the basic implementation you might consult the
following book which is also cited in the GW tutorial web page.

http://www.physics.ohio-state.edu/~wilkins/vita/gw_review.ps

Just to give you an overview of the standard
flowchart of the screening code:

screening.F90 performs the setup of different quantities
needed during the calculation.

cchi0 and cchi0q0 evaluate the irreducible polarizability, \chi_0,
using the Alder-Wiser expression.

In make_epsm1_driver.F90 the inverse dielectric matrix
is calculated starting from \chi_0 and the result is saved
on the SCR file

Best Regards
Matteo Giantomassi