Correlation energy for the homogeneous electron gas: Exact Bethe-Salpeter solution and an approximate evaluation
- Author(s)
- Emanuele Maggio, Georg Kresse
- Abstract
The correlation energy of the homogeneous electron gas is evaluated by solving the Bethe-Salpeter equation (BSE) beyond the Tamm-Dancoff approximation for the electronic polarization propagator. The BSE is expected to improve on the random-phase approximation, owing to the inclusion of exchange diagrams. For instance, since the BSE reduces in second order to Møller-Plesset perturbation theory, it is self-interaction free in second order. Results for the correlation energy are compared with quantum Monte Carlo benchmarks and excellent agreement is observed. For low densities, however, we find imaginary eigenmodes in the polarization propagator. To avoid the occurrence of imaginary eigenmodes, an approximation to the BSE kernel is proposed that allows us to completely remove this issue in the low-electron-density region. We refer to this approximation as the random-phase approximation with screened exchange (RPAsX). We show that this approximation even slightly improves upon the standard BSE kernel.
- Organisation(s)
- Computational Materials Physics
- Journal
- Physical Review B
- Volume
- 93
- No. of pages
- 12
- ISSN
- 1098-0121
- DOI
- https://doi.org/10.1103/PhysRevB.93.235113
- Publication date
- 06-2016
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103025 Quantum mechanics, 103036 Theoretical physics, 103015 Condensed matter, 103009 Solid state physics
- Keywords
- ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials, Condensed Matter Physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/correlation-energy-for-the-homogeneous-electron-gas-exact-bethesalpeter-solution-and-an-approximate-evaluation(584dace5-067d-4f52-acdf-1262bb45cc51).html