Diagrammatic routes to nonlocal correlations beyond dynamical mean field theory

G Rohringer, H Hafermann, A Toschi, AA Katanin… - Reviews of Modern …, 2018 - APS
Strong electronic correlations pose one of the biggest challenges to solid state theory.
Recently developed methods that address this problem by starting with the local, eminently …

Quantitative theory of magnetic interactions in solids

A Szilva, Y Kvashnin, EA Stepanov, L Nordström… - Reviews of Modern …, 2023 - APS
This review addresses the method of explicit calculations of interatomic exchange
interactions of magnetic materials. This involves exchange mechanisms normally referred to …

Tracking the footprints of spin fluctuations: A multimethod, multimessenger study of the two-dimensional Hubbard model

T Schäfer, N Wentzell, F Šimkovic IV, YY He, C Hille… - Physical Review X, 2021 - APS
The Hubbard model represents the fundamental model for interacting quantum systems and
electronic correlations. Using the two-dimensional half-filled Hubbard model at weak …

Charge density wave ordering in NdNiO2: effects of multiorbital nonlocal correlations

EA Stepanov, M Vandelli, AI Lichtenstein… - npj Computational …, 2024 - nature.com
In this work, we investigate collective electronic fluctuations and, in particular, the possibility
of the charge density wave ordering in an infinite-layer NdNiO2. We perform advanced many …

Multitier self-consistent

F Nilsson, L Boehnke, P Werner, F Aryasetiawan - Physical Review Materials, 2017 - APS
We discuss a parameter-free and computationally efficient ab initio simulation approach for
moderately and strongly correlated materials, the multitier self-consistent GW+ EDMFT …

Single-boson exchange decomposition of the vertex function

F Krien, A Valli, M Capone - Physical Review B, 2019 - APS
We present a decomposition of the two-particle vertex function of the single-band Anderson
impurity model which imparts a physical interpretation of the vertex in terms of the exchange …

Consistent partial bosonization of the extended Hubbard model

EA Stepanov, V Harkov, AI Lichtenstein - Physical Review B, 2019 - APS
We design an efficient and balanced approach that captures major effects of collective
electronic fluctuations in strongly correlated fermionic systems using a simple diagrammatic …

Impact of partially bosonized collective fluctuations on electronic degrees of freedom

V Harkov, M Vandelli, S Brener, AI Lichtenstein… - Physical Review B, 2021 - APS
In this work we present a comprehensive analysis of collective electronic fluctuations and
their effect on single-particle properties of the Hubbard model. Our approach is based on a …

Can Orbital-Selective Néel Transitions Survive Strong Nonlocal Electronic Correlations?

EA Stepanov, S Biermann - Physical Review Letters, 2024 - APS
Spin-or orbital-selective behaviors in correlated electron materials offer rich promise for
spintronics or orbitronics phenomena and applications deriving from them. Strong local …

Improved effective vertices in the multiorbital two-particle self-consistent method from dynamical mean-field theory

K Zantout, S Backes, A Razpopov, D Lessnich… - Physical Review B, 2023 - APS
In this paper, we present a multiorbital form of the two-particle self-consistent approach
(TPSC) where the effective local and static irreducible interaction vertices are determined by …