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gavinliu7390(½ð±Ò+2):лл½»Á÷£¡ 2010-04-26 10:58
The GW method


Calculations of ground-state and excited-state properties of materials have been one of
the major goals of condensed matter physics. Ground-state properties of solids have
been extensively investigated for several decades within the standard density functional
theory. Excited-state properties, on the other hand, were relatively unexplored in ab initio
calculations until a decade ago. The most suitable approach up to now for studying excited-
state properties of extended systems is the Green function method. To calculate the Green
function one requires the self-energy operator which is non-local and energy dependent.
In this article we describe the GW approximation which has turned out to be a fruitful
approximation to the self-energy. The Green function theory, numerical methods for
carrying out the self-energy calculations, simplified schemes, and applications to various
systems are described. Self-consistency issue and new developments beyond the GW
approximation are also discussed as well as the success and shortcomings of the GW
approximation.
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