Journal
PHYSICAL REVIEW B
Volume 93, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.195105
Keywords
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Funding
- Austrian Science Fund (FWF) through Deutsche Forschungsgemeinschaft [I-610-N16, FOR 1346]
- European Research Council (ERC) under the European Union's Seventh Framework Program (FP)/ERC [306447]
- Austrian Science Fund (FWF) [I 1395, I 610] Funding Source: researchfish
- Austrian Science Fund (FWF) [I610, I1395] Funding Source: Austrian Science Fund (FWF)
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We derive an analytical expression for the local two-particle vertex of the Falicov-Kimball model, including its dependence on all three frequencies, the full vertex, and all reducible vertices. This allows us to calculate the self-energy in diagrammatic extensions of dynamical mean field theory, specifically in the dual fermion and the one-particle irreducible approach. Nonlocal correlations are thence included and originate here from charge-density wave fluctuations. At low temperatures and in two dimensions, they lead to a larger self-energy contribution at low frequencies and a more insulating spectrum.
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