Quasiparticle self-consistent $GW$ method; a basis for the independent-particle approximation

Kotani, Takao; van Schilfgaarde, Mark; Faleev, Sergey V.

Quasiparticle self-consistent $GW$ method; a basis for the independent-particle approximation

Authors

Kotani, Takao

van Schilfgaarde, Mark

Faleev, Sergey V.

Description

We have developed a new type of self-consistent scheme within the $GW$ approximation, which we call quasiparticle self-consistent $GW$ (QS$GW$). We have shown that QS$GW$ rather well describes energy bands for a wide-range of materials, including many where the local-density approximation fails. QS$GW$ contains physical effects found in other theories such as LDA$+U$, SIC and $GW$ in a satisfactory manner without many of their drawbacks (partitioning of itinerant and localized electrons, adjustable parameters, ambiguities in double-counting, etc.). We present some theoretical discussion concerning the formulation of QS$GW$, including a prescriptino for calculating the total energy. We also address several key methodological points needed for implementation. We then show convergence checks and some representative results in a variety of materials.
v2:the same as previous version --but better tex file; v3:add appendix and modify introduction,mainly; v4 mainly, theoretical section (IB IC) are renewed