Assessment of the GW approximation using Hubbard chains

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dc.creatorPollehn, Thomas J.
dc.creatorSchindlmayr, Arno
dc.creatorGodby, R. W.
dc.date1997-11-13
dc.date.accessioned2026-07-07T06:29:49Z
dc.date.available2026-07-07T06:29:49Z
dc.descriptionWe investigate the performance of the GW approximation by comparison to exact results for small model systems. The role of the chemical potentials in Dyson's equation as well as the consequences of numerical resonance broadening are examined, and we show how a proper treatment can improve computational implementations of many-body perturbation theory in general. GW and exchange-only calculations are performed over a wide range of fractional band fillings and correlation strengths. We thus identify the physical situations where these schemes are applicable.
dc.description14 pages including 5 figures, LaTeX
dc.identifierhttps://arxiv.org/abs/cond-mat/9711120
dc.identifierhttp://arxiv.org/abs/cond-mat/9711120
dc.identifierJ. Phys.: Condens. Matter 10, 1273 (1998).
dc.identifierdoi:10.1088/0953-8984/10/6/011
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/98173
dc.subjectMaterials Science
dc.subjectStrongly Correlated Electrons
dc.titleAssessment of the GW approximation using Hubbard chains
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