463 citations · 3k across the 44 of their papers we have counts for
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Superconductivity, antiferromagnetism and phase separation in the two-dimensional Hubbard model: A dual-fermion approach
Junya Otsuki, Hartmut Hafermann, Alexander I. Lichtenstein
The dual-fermion approach offers a way to perform diagrammatic expansion around the dynamical mean-field theory. Using this formalism, the influence of antiferromagnetic fluctuatio…
From Hubbard bands to spin-polaron excitations in the doped Mott material NaCoO
Aljoscha Wilhelm, Frank Lechermann, Hartmut Hafermann +2
We investigate the excitation spectrum of strongly correlated sodium cobaltate within a realistic many-body description beyond dynamical mean-field theory (DMFT). At lower doping a…
Beyond extended dynamical mean-field theory: Dual boson approach to the two-dimensional extended Hubbard model
Erik G. C. P. van Loon, Alexander I. Lichtenstein, Mikhail I. Katsnelson +2
The dual boson approach [Ann. Phys. 327, 1320 (2012)] provides a means to construct a diagrammatic expansion around the extended dynamical mean-field theory (EDMFT). In this paper,…
Collective Charge Excitations of Strongly Correlated Electrons, Vertex Corrections and Gauge Invariance
Hartmut Hafermann, Erik G. C. P. van Loon, Mikhail I. Katsnelson +2
We consider the collective, long-wavelength charge excitations in correlated media in presence of short- and long-range forces. As an example for the case of a short-range interact…
Plasmons in strongly correlated systems: spectral weight transfer and renormalized dispersion
E. G. C. P. van Loon, H. Hafermann, A. I. Lichtenstein +2
We study the charge-density dynamics within the two-dimensional extended Hubbard model in the presence of long-range Coulomb interaction across the metal-insulator transition point…