期刊
PHYSICAL REVIEW B
卷 91, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.121107
关键词
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资金
- Austrian Science Fund (FWF) within the German Research Foundation (DFG) unit FOR [I-597-N16, 1346]
- FWF through the Doctoral School Building Solids for Function [W1243]
- Austrian Science Fund (FWF) [I 1395] Funding Source: researchfish
- Austrian Science Fund (FWF) [I1395, W1243] Funding Source: Austrian Science Fund (FWF)
While second-order phase transitions always cause strong nonlocal fluctuations, their effect on spectral properties crucially depends on the dimensionality. For the important case of three dimensions, we show that the electron self-energy is well separable into a local dynamical part and static nonlocal contributions. In particular, our nonperturbative many-body calculations for the three-dimensional Hubbard model at different fillings demonstrate that the quasiparticle weight remains essentially momentum independent, including in the presence of overall large nonlocal corrections to the self-energy. Relying on this insight, we propose a space-time-separated scheme for many-body perturbation theory that is up to ten times more efficient than current implementations. Besides these far-reaching implications for state-of-the-art electronic structure schemes, our analysis will also provide guidance to the quest of going beyond them.
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