Extended crossover from a Fermi liquid to a quasiantiferromagnet in the half-filled 2D Hubbard model

F Šimkovic IV, JPF LeBlanc, AJ Kim, Y Deng… - Physical Review Letters, 2020‏ - APS
The ground state of the Hubbard model with nearest-neighbor hop** on the square lattice
at half filling is known to be that of an antiferromagnetic (AFM) band insulator for any on-site …

Fingerprints of the local moment formation and its Kondo screening in the generalized susceptibilities of many-electron problems

P Chalupa, T Schäfer, M Reitner, D Springer… - Physical Review Letters, 2021‏ - APS
We identify the precise hallmarks of the local magnetic moment formation and its Kondo
screening in the frequency structure of the generalized charge susceptibility. The sharpness …

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 …

Boson-exchange parquet solver for dual fermions

F Krien, A Valli, P Chalupa, M Capone, AI Lichtenstein… - Physical Review B, 2020‏ - APS
We present and implement a parquet approximation within the dual-fermion formalism
based on a partial bosonization of the dual vertex function which substantially reduces the …

Explaining the pseudogap through dam** and antidam** on the Fermi surface by imaginary spin scattering

F Krien, P Worm, P Chalupa-Gantner, A Toschi… - Communications …, 2022‏ - nature.com
The mechanism of the pseudogap observed in hole-doped cuprates remains one of the
central puzzles in condensed matter physics. We analyze this phenomenon via a Feynman …

Self-consistent ladder dynamical vertex approximation

J Kaufmann, C Eckhardt, M Pickem, M Kitatani… - Physical Review B, 2021‏ - APS
We present and implement a self-consistent D Γ A approach for multiorbital models and ab
initio materials calculations. It is applied to the one-band Hubbard model at various …

Charge transport in the Hubbard model at high temperatures: Triangular versus square lattice

A Vranić, J Vučičević, J Kokalj, J Skolimowski, R Žitko… - Physical Review B, 2020‏ - APS
High-temperature bad-metal transport has been recently studied both theoretically and in
experiments as one of the key signatures of strong electronic correlations. Here we use the …

Investigating ultrafast quantum magnetism with machine learning

G Fabiani, JH Mentink - SciPost Physics, 2019‏ - scipost.org
We investigate the efficiency of the recently proposed Restricted Boltzmann Machine (RBM)
representation of quantum many-body states to study both the static properties and quantum …

Analytic continuation of multipoint correlation functions

A Ge, J Halbinger, SSB Lee, J von Delft… - Annalen der …, 2024‏ - Wiley Online Library
Conceptually, the Matsubara formalism (MF), using imaginary frequencies, and the Keldysh
formalism (KF), formulated in real frequencies, give equivalent results for systems in thermal …

Single-boson exchange representation of the functional renormalization group for strongly interacting many-electron systems

PM Bonetti, A Toschi, C Hille, S Andergassen… - Physical Review …, 2022‏ - APS
We present a reformulation of the functional renormalization group (fRG) for many-electron
systems, which relies on the recently introduced single-boson exchange (SBE) …