Self-consistent GW0 results for the electron gas: Fixed screened potential W0 within the random-phase approximation
(1996) In Physical Review B 54.- Abstract
- With the aim of properly understanding the basis for and the utility of many-body perturbation theory as applied to extended metallic systems, we have calculated the electronic self-energy of the homogeneous electron gas within the GW approximation. The calculation has been carried out in a self-consistent way; i.e., the one-electron Green function obtained from Dyson’s equation is the same as that used to calculate the self-energy. The self-consistency is restricted in the sense that the screened interaction W is kept fixed and equal to that of the random-phase approximation for the gas. We have found that the final results are marginally affected by the broadening of the quasiparticles, and that their self-consistent energies are still... (More)
- With the aim of properly understanding the basis for and the utility of many-body perturbation theory as applied to extended metallic systems, we have calculated the electronic self-energy of the homogeneous electron gas within the GW approximation. The calculation has been carried out in a self-consistent way; i.e., the one-electron Green function obtained from Dyson’s equation is the same as that used to calculate the self-energy. The self-consistency is restricted in the sense that the screened interaction W is kept fixed and equal to that of the random-phase approximation for the gas. We have found that the final results are marginally affected by the broadening of the quasiparticles, and that their self-consistent energies are still close to their free-electron counterparts as they are in non-self-consistent calculations. The reduction in strength of the quasiparticles and the development of satellite structure (plasmons) gives, however, a markedly smaller dynamical self-energy leading to, e.g., a smaller reduction in the quasiparticle strength as compared to non-self-consistent results. The relatively bad description of plasmon structure within the non-self-consistent GW approximation is marginally improved. A first attempt at including W in the self-consistency cycle leads to an even broader and structureless satellite spectrum in disagreement with experiment. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/952108
- author
- von Barth, Ulf LU and Holm, Bengt
- organization
- publishing date
- 1996
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 54
- article number
- 8411
- publisher
- American Physical Society
- external identifiers
-
- scopus:0001658969
- ISSN
- 1550-235X
- DOI
- 10.1103/PhysRevB.54.8411
- language
- English
- LU publication?
- yes
- id
- 4cf07f90-ef74-4895-a097-199e706a9b46 (old id 952108)
- date added to LUP
- 2016-04-04 12:10:31
- date last changed
- 2022-01-29 23:03:24
@article{4cf07f90-ef74-4895-a097-199e706a9b46,
abstract = {{With the aim of properly understanding the basis for and the utility of many-body perturbation theory as applied to extended metallic systems, we have calculated the electronic self-energy of the homogeneous electron gas within the GW approximation. The calculation has been carried out in a self-consistent way; i.e., the one-electron Green function obtained from Dyson’s equation is the same as that used to calculate the self-energy. The self-consistency is restricted in the sense that the screened interaction W is kept fixed and equal to that of the random-phase approximation for the gas. We have found that the final results are marginally affected by the broadening of the quasiparticles, and that their self-consistent energies are still close to their free-electron counterparts as they are in non-self-consistent calculations. The reduction in strength of the quasiparticles and the development of satellite structure (plasmons) gives, however, a markedly smaller dynamical self-energy leading to, e.g., a smaller reduction in the quasiparticle strength as compared to non-self-consistent results. The relatively bad description of plasmon structure within the non-self-consistent GW approximation is marginally improved. A first attempt at including W in the self-consistency cycle leads to an even broader and structureless satellite spectrum in disagreement with experiment.}},
author = {{von Barth, Ulf and Holm, Bengt}},
issn = {{1550-235X}},
language = {{eng}},
publisher = {{American Physical Society}},
series = {{Physical Review B}},
title = {{Self-consistent GW0 results for the electron gas: Fixed screened potential W0 within the random-phase approximation}},
url = {{http://dx.doi.org/10.1103/PhysRevB.54.8411}},
doi = {{10.1103/PhysRevB.54.8411}},
volume = {{54}},
year = {{1996}},
}