期刊
PHYSICAL REVIEW B
卷 91, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.115115
关键词
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资金
- Austrian Science Fund (FWF) [I-610-N16]
- FWF Doctoral School [SFB ViCoM F41]
- Deutsche Forschungsgemeinschaft [FOR 1346, ZUK 63, SFB/TRR 21]
- European Research Council under the European Union [306447]
- Austrian Science Fund (FWF) [I 1395, I 610] Funding Source: researchfish
- Austrian Science Fund (FWF) [I610, I1395, W1243] Funding Source: Austrian Science Fund (FWF)
We have implemented the dynamical vertex approximation (D Gamma A) in its full parquet-based version to include spatial correlations on all length scales and in all scattering channels. The algorithm is applied to study the electronic self-energies and the spectral properties of finite-size one-dimensional Hubbard models with periodic boundary conditions (nanoscopic Hubbard rings). From a methodological point of view, our calculations and their comparison to the results obtained within dynamical mean-field theory, plain parquet approximation, and the exact numerical solution allow us to evaluate the performance of the D Gamma A algorithm in the most challenging situation of low dimensions. From a physical perspective, our results unveil how nonlocal correlations affect the spectral properties of nanoscopic systems of various sizes in different regimes of interaction strength.
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