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- National Institute of Standards and TechnologyUS36 papers
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- Yukhnovskii Institute for Condensed Matter Physics of the National Academy of Sciences of UkraineUA21 papers
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Showing 2020 · cond-mat.str-elShow all
3 papers · 2 filters
cond-mat.str-el2020★ 27 cited
The dynamical vertex approximation for many-electron systems with spontaneously broken SU(2)-symmetry
Lorenzo Del Re, Alessandro Toschi
We generalize the formalism of the dynamical vertex approximation (DA) -- a diagrammatic extension of the dynamical mean-field theory (DMFT)-- to treat magnetically ordered phas…
cond-mat.str-el2020★ 17 cited
Valence-Bond Order in a Honeycomb Antiferromagnet Coupled to Quantum Phonons
Manuel Weber
We use exact quantum Monte Carlo simulations to demonstrate that the Néel ground state of an antiferromagnetic SU(2) spin- Heisenberg model on the honeycomb lattice ca…
cond-mat.str-el2020★ 65 cited
Attractive effect of a strong electronic repulsion -- the physics of vertex divergences
M. Reitner, P. Chalupa, L. Del Re +4
While the breakdown of the perturbation expansion for the many-electron problem has several formal consequences, here we unveil its physical effect: Flipping the sign of the effect…