Why this code

This code has been conceived with the purpose of enabling GW calculations in large model structures, as for such systems sums over empty states become a serious issue we devised a method to eliminate them completely from the calculation.

Main features

  • GAWA approximation
  • Basis for polarizability operators: G vectors or optimal basis sets
  • No sums over empty states
  • Treatment of isolated and extended systems
  • Analytic continuation approach
  • collinear spin polarization

Main features not released yet or under development

  • Contour integration
  • off-diagonal self-energy terms
  • approximate treatment of semicore states
  • partially occupied states

These programs are distributed in the hope that they will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.