## Abstract

We present a detailed account of the GW space-time method. The method increases the size of systems whose electronic structure can be studied with a computational implementation of Hedin's GW approximation. At the heart of the method is a representation of the Green function G and the screened Coulomb interaction W in the real-space and imaginary-time domain, which allows a more efficient computation of the self-energy approximation Sigma = iGW. For intermediate steps we freely change between representations in real and reciprocal space on the one hand, and imaginary time and imaginary energy on the other, using fast Fourier transforms. The power of the method is demonstrated using the example of Si with artificially increased unit cell sizes. (C) 1999 Elsevier Science B.V.

Original language | English |
---|---|

Pages (from-to) | 211-228 |

Number of pages | 18 |

Journal | Computer Physics Communications |

Volume | 117 |

Issue number | 3 |

DOIs | |

Publication status | Published - Mar 1999 |

### Bibliographical note

© 1999 Elsevier. Published in Computer Physics Communications and uploaded in accordance with the publisher's self archiving policy.## Keywords

- electronic structure
- quasiparticle energies
- self-energy calculations
- GW approximation
- PARTICLE BAND-STRUCTURE
- AB-INITIO CALCULATIONS
- QUASI-PARTICLE
- SURFACE-STATES
- INVERSE-PHOTOEMISSION
- ELECTRON
- SEMICONDUCTORS
- INSULATORS
- SILICON
- APPROXIMATION