1.3k citations · 8.5k across the 97 of their papers we have counts for
98 papers
Non-perturbative effects of short-range spatial correlations at the two-particle level
Michael Meixner, Matthias Reitner, Thomas Schäfer +1
By means of cellular dynamical mean-field theory (CDMFT) we study how short-range correlations drive the breakdown of the self-consistent perturbation theory in two-dimensional sys…
Few is different: deciphering many-body dynamics in mesoscopic quantum gases
Juergen Berges, Sandra Brandstetter, Jasmine Brewer +27
Emergent macroscopic descriptions of matter, such as hydrodynamics, are central to our description of complex physical systems across a wide spectrum of energy scales. The conventi…
Magnetic quantum criticality: The role of the Fermi surface geometry
D. R. Fus, S. Adler, M. O. Malcolms +5
We investigate magnetic quantum phase-transitions in bulk correlated metals. To this end, we focus on the Hubbard model on different cubic lattices as a function of temperature and…
Simulations of stochastic fluid dynamics near a critical point in the phase diagram
Chandrodoy Chattopadhyay, Josh Ott, Thomas Schaefer +1
We present simulations of stochastic fluid dynamics in the vicinity of a critical endpoint belonging to the universality class of the Ising model. This study is motivated by the ch…
Superconductivity and Mottness in Organic Charge Transfer Materials
Henri Menke, Marcel Klett, Kazushi Kanoda +3
The phase diagrams of quasi two-dimensional organic superconductors display a plethora of fundamental phenomena associated with strong electron correlations, such as unconventional…
Far-off-equilibrium early-stage dynamics in high-energy nuclear collisions
Chandrodoy Chattopadhyay, Ulrich Heinz, Thomas Schaefer
We explore the far-off-equilibrium aspects of the (1+1)-dimensional early-stage evolution of a weakly-coupled quark-gluon plasma using kinetic theory and hydrodynamics. For a large…
Single-particle spectra and magnetic susceptibility in the Emery model: a dynamical mean-field perspective
Yi-Ting Tseng, Mário O. Malcolms, Henri Menke +3
We investigate dynamical mean-field calculations of the three-band Emery model at the one- and two-particle level for material-realistic parameters of high- superconductors. O…
Mott transition and pseudogap of the square-lattice Hubbard model: results from center-focused cellular dynamical mean-field theory
Michael Meixner, Henri Menke, Marcel Klett +4
The recently proposed center-focused post-processing procedure [Phys. Rev. Research 2, 033476 (2020)] of cellular dynamical mean-field theory suggests that central sites of large i…
Thermodynamic Stability at the Two-Particle Level
A. Kowalski, M. Reitner, L. Del Re +6
We show how the stability conditions for a system of interacting fermions that conventionally involve variations of thermodynamic potentials can be rewritten in terms of one- and t…
Fluid dynamics from the Boltzmann equation using a maximum entropy distribution
Chandrodoy Chattopadhyay, Ulrich Heinz, Thomas Schaefer
Using the recently developed ``Maximum Entropy'' (or ``least biased'') distribution function to truncate the moment hierarchy arising from kinetic theory, we formulate a far-from-e…
Magnetism and Metallicity in Moiré Transition Metal Dichalcogenides
Patrick Tscheppe, Jiawei Zang, Marcel Klett +8
The ability to control the properties of twisted bilayer transition metal dichalcogenides in situ makes them an ideal platform for investigating the interplay of strong correlation…
Dynamic scaling of order parameter fluctuations in model B
Chandrodoy Chattopadhyay, Josh Ott, Thomas Schaefer +1
We describe numerical simulations of the stochastic diffusion equation with a conserved charge. We focus on the dynamics in the vicinity of a critical point in the Ising universali…
N-particle irreducible actions for stochastic fluids
Jingyi Chao, Thomas Schaefer
We construct one- and two-particle irreducible (1PI and 2PI) effective actions for the stochastic fluid dynamics of a conserved density undergoing diffusive motion. We compute the…
Symmetry-broken perturbation theory to large orders in antiferromagnetic phases
R. Garioud, F. Šimkovic, R. Rossi +4
We introduce a spin-symmetry-broken extension of the connected determinant algorithm [Phys. Rev. Lett. 119, 045701 (2017)]. The resulting systematic perturbative expansions around…
Far-off-equilibrium expansion trajectories in the QCD phase diagram
Chandrodoy Chattopadhyay, Ulrich Heinz, Thomas Schaefer
We consider the hydrodynamic evolution of a quark-gluon gas with non-zero quark masses and net baryon number in its phase diagram. For far-off-equilibrium initial conditions the ex…
Dynamics of non-Gaussian fluctuations in model A
Thomas Schaefer, Vladimir Skokov
Motivated by the experimental search for the QCD critical point we perform simulations of a stochastic field theory with purely relaxational dynamics (model A). We verify the expec…
Strongly correlated superconductivity with long-range spatial fluctuations
Motoharu Kitatani, Ryotaro Arita, Thomas Schäfer +1
We review recent studies for superconductivity using diagrammatic extensions of dynamical mean field theory. These approaches take into account simultaneously both, the local corre…
Magnetic properties and pseudogap formation in infinite-layer nickelates: insights from the single-band Hubbard model
Marcel Klett, Philipp Hansmann, Thomas Schäfer
We study the magnetic and spectral properties of a single-band Hubbard model for the infinite-layer nickelate compound LaNiO. As spatial correlations turn out to be the key ing…
Magnetic correlations in infinite-layer nickelates: an experimental and theoretical multi-method study
R. A. Ortiz, P. Puphal, M. Klett +12
We report a comprehensive study of magnetic correlations in LaNiO, a parent compound of the recently discovered family of infinite-layer (IL) nickelate superconductors, using…
The Hubbard model: A computational perspective
Mingpu Qin, Thomas Schäfer, Sabine Andergassen +2
The Hubbard model is the simplest model of interacting fermions on a lattice and is of similar importance to correlated electron physics as the Ising model is to statistical mechan…
Why the critical temperature of high- cuprate superconductors is so low: The importance of the dynamical vertex structure
Motoharu Kitatani, Thomas Schäfer, Hideo Aoki +1
To fathom the mechanism of high-temperature () superconductivity, the dynamical vertex approximation (DA) is evoked for the two-dimensional repulsive Hubbard model. A…
Divergences of the irreducible vertex functions in correlated metallic systems: Insights from the Anderson Impurity Model
P. Chalupa, P. Gunacker, T. Schäfer +2
In this work, we analyze in detail the occurrence of divergences in the irreducible vertex functions for one of the fundamental models of many-body physics: the Anderson impurity m…
Toward the description of fluid dynamical fluctuations in heavy-ion collisions
Marlene Nahrgang, Marcus Bluhm, Thomas Schäfer +1
In this talk we present results obtained when fluid dynamical fluctuations are included in relativistic dimensional viscous fluid dynamics. We discuss effects of the interact…
Breakdown of traditional many-body theories for correlated electrons
O. Gunnarsson, G. Rohringer, T. Schäfer +2
Starting from the (Hubbard) model of an atom, we demonstrate that the uniqueness of the mapping from the interacting to the noninteracting Green's function, , is strongly…