Selfconsistent GW0 results for the electron gas: Fixed screened potential W0 within the randomphase approximation
(1996) In Physical Review B 54. Abstract
 With the aim of properly understanding the basis for and the utility of manybody perturbation theory as applied to extended metallic systems, we have calculated the electronic selfenergy of the homogeneous electron gas within the GW approximation. The calculation has been carried out in a selfconsistent way; i.e., the oneelectron Green function obtained from Dyson’s equation is the same as that used to calculate the selfenergy. The selfconsistency is restricted in the sense that the screened interaction W is kept fixed and equal to that of the randomphase approximation for the gas. We have found that the final results are marginally affected by the broadening of the quasiparticles, and that their selfconsistent energies are still... (More)
 With the aim of properly understanding the basis for and the utility of manybody perturbation theory as applied to extended metallic systems, we have calculated the electronic selfenergy of the homogeneous electron gas within the GW approximation. The calculation has been carried out in a selfconsistent way; i.e., the oneelectron Green function obtained from Dyson’s equation is the same as that used to calculate the selfenergy. The selfconsistency is restricted in the sense that the screened interaction W is kept fixed and equal to that of the randomphase approximation for the gas. We have found that the final results are marginally affected by the broadening of the quasiparticles, and that their selfconsistent energies are still close to their freeelectron counterparts as they are in nonselfconsistent calculations. The reduction in strength of the quasiparticles and the development of satellite structure (plasmons) gives, however, a markedly smaller dynamical selfenergy leading to, e.g., a smaller reduction in the quasiparticle strength as compared to nonselfconsistent results. The relatively bad description of plasmon structure within the nonselfconsistent GW approximation is marginally improved. A first attempt at including W in the selfconsistency 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:
http://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
 publisher
 American Physical Society
 external identifiers

 scopus:0001658969
 ISSN
 1550235X
 DOI
 10.1103/PhysRevB.54.8411
 language
 English
 LU publication?
 yes
 id
 4cf07f90ef744895a097199e706a9b46 (old id 952108)
 date added to LUP
 20080124 16:21:52
 date last changed
 20171022 05:07:38
@article{4cf07f90ef744895a097199e706a9b46, abstract = {With the aim of properly understanding the basis for and the utility of manybody perturbation theory as applied to extended metallic systems, we have calculated the electronic selfenergy of the homogeneous electron gas within the GW approximation. The calculation has been carried out in a selfconsistent way; i.e., the oneelectron Green function obtained from Dyson’s equation is the same as that used to calculate the selfenergy. The selfconsistency is restricted in the sense that the screened interaction W is kept fixed and equal to that of the randomphase approximation for the gas. We have found that the final results are marginally affected by the broadening of the quasiparticles, and that their selfconsistent energies are still close to their freeelectron counterparts as they are in nonselfconsistent calculations. The reduction in strength of the quasiparticles and the development of satellite structure (plasmons) gives, however, a markedly smaller dynamical selfenergy leading to, e.g., a smaller reduction in the quasiparticle strength as compared to nonselfconsistent results. The relatively bad description of plasmon structure within the nonselfconsistent GW approximation is marginally improved. A first attempt at including W in the selfconsistency cycle leads to an even broader and structureless satellite spectrum in disagreement with experiment.}, articleno = {8411}, author = {von Barth, Ulf and Holm, Bengt}, issn = {1550235X}, language = {eng}, publisher = {American Physical Society}, series = {Physical Review B}, title = {Selfconsistent GW0 results for the electron gas: Fixed screened potential W0 within the randomphase approximation}, url = {http://dx.doi.org/10.1103/PhysRevB.54.8411}, volume = {54}, year = {1996}, }