Journal
PHYSICAL REVIEW B
Volume 91, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.125109
Keywords
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Funding
- Austrian Science Fund (FWF) [W1243]
- SFB ViCoM (FWF) [F4103]
- NAWI Graz
- German Research Foundation (DFG) [FOR 1346, GSC 266]
- Austrian Science Fund (FWF) [I1395, W1243] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [I 1395] Funding Source: researchfish
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We have studied the impact of nonlocal electronic correlations at all length scales on the Mott-Hubbard metal-insulator transition in the unfrustrated two-dimensional Hubbard model. Combining dynamical vertex approximation, lattice quantum Monte Carlo, and variational cluster approximation, we demonstrate that scattering at long-range fluctuations, i.e., Slater-like paramagnons, opens a spectral gap at weak-to-intermediate coupling, irrespective of the preformation of localized or short-range magnetic moments. This is the reason why the two-dimensional Hubbard model has a paramagnetic phase which is insulating at low enough temperatures for any (finite) interaction and no Mott-Hubbard transition is observed.
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