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 …

Quenched Pair Breaking by Interlayer Correlations as a Key to Superconductivity in

S Ryee, N Witt, TO Wehling - Physical Review Letters, 2024 - APS
The recent discovery of superconductivity in La 3 Ni 2 O 7 with T c≃ 80 K under high
pressure opens up a new route to high-T c superconductivity. This material realizes a bilayer …

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 …

Local electronic correlation at the two-particle level

G Rohringer, A Valli, A Toschi - Physical Review B—Condensed Matter and …, 2012 - APS
Electronic-correlated systems are often well described by dynamical mean field theory
(DMFT). While DMFT studies have mainly focused hitherto on one-particle properties …

Low-depth circuit ansatz for preparing correlated fermionic states on a quantum computer

PL Dallaire-Demers, J Romero, L Veis… - Quantum Science …, 2019 - iopscience.iop.org
Quantum simulations are bound to be one of the main applications of near-term quantum
computers. Quantum chemistry and condensed matter physics are expected to benefit from …

Fluctuation diagnostics of the electron self-energy: Origin of the pseudogap physics

O Gunnarsson, T Schäfer, JPF LeBlanc, E Gull… - Physical review …, 2015 - APS
We demonstrate how to identify which physical processes dominate the low-energy spectral
functions of correlated electron systems. We obtain an unambiguous classification through …

Divergent precursors of the Mott-Hubbard transition at the two-particle level

T Schäfer, G Rohringer, O Gunnarsson, S Ciuchi… - Physical Review Letters, 2013 - APS
Identifying the fingerprints of the Mott-Hubbard metal-insulator transition may be quite
elusive in correlated metallic systems if the analysis is limited to the single particle level …

Towards ab initio calculations with the dynamical vertex approximation

A Galler, J Kaufmann, P Gunacker… - Journal of the Physical …, 2018 - journals.jps.jp
While key effects of the many-body problem—such as Kondo and Mott physics—can be
understood in terms of on-site correlations, non-local fluctuations of charge, spin, and …

Inhomogeneous field theory inside the arctic circle

N Allegra, J Dubail, JM Stéphan… - Journal of Statistical …, 2016 - iopscience.iop.org
Motivated by quantum quenches in spin chains, a one-dimensional toy-model of fermionic
particles evolving in imaginary-time from a domain-wall initial state is solved. The main …

High-frequency asymptotics of the vertex function: Diagrammatic parametrization and algorithmic implementation

N Wentzell, G Li, A Tagliavini, C Taranto, G Rohringer… - Physical Review B, 2020 - APS
Vertex functions are a crucial ingredient of several forefront many-body algorithms in
condensed matter physics. However, the full treatment of their frequency and momentum …