Diagrammatic routes to nonlocal correlations beyond dynamical mean field theory
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 …
Recently developed methods that address this problem by starting with the local, eminently …
Tracking the footprints of spin fluctuations: A multimethod, multimessenger study of the two-dimensional Hubbard model
The Hubbard model represents the fundamental model for interacting quantum systems and
electronic correlations. Using the two-dimensional half-filled Hubbard model at weak …
electronic correlations. Using the two-dimensional half-filled Hubbard model at weak …
Towards the solution of the many-electron problem in real materials: Equation of state of the hydrogen chain with state-of-the-art many-body methods
We present numerical results for the equation of state of an infinite chain of hydrogen atoms.
A variety of modern many-body methods are employed, with exhaustive cross-checks and …
A variety of modern many-body methods are employed, with exhaustive cross-checks and …
Analytical continuation of matrix-valued functions: Carathéodory formalism
Finite-temperature quantum field theories are formulated in terms of Green's functions and
self-energies on the Matsubara axis. In multiorbital systems, these quantities are related to …
self-energies on the Matsubara axis. In multiorbital systems, these quantities are related to …
Robust analytic continuation of Green's functions via projection, pole estimation, and semidefinite relaxation
Green's functions of fermions are described by matrix-valued Herglotz-Nevanlinna functions.
Since analytic continuation is fundamentally an ill-posed problem, the causal space …
Since analytic continuation is fundamentally an ill-posed problem, the causal space …
w2dynamics: Local one-and two-particle quantities from dynamical mean field theory
We describe the hybridization-expansion continuous-time quantum Monte Carlo code
package “w2dynamics”, developed in Wien and Würzburg. We discuss the main features of …
package “w2dynamics”, developed in Wien and Würzburg. We discuss the main features of …
Compressing Green's function using intermediate representation between imaginary-time and real-frequency domains
Model-independent compact representations of imaginary-time data are presented in terms
of the intermediate representation (IR) of analytical continuation. We demonstrate the …
of the intermediate representation (IR) of analytical continuation. We demonstrate the …
Scalable spin squeezing from finite-temperature easy-plane magnetism
Spin squeezing is a form of entanglement that reshapes the quantum projection noise to
improve measurement precision. Here, we provide numerical and analytic evidence for the …
improve measurement precision. Here, we provide numerical and analytic evidence for the …
Implementation of the maximum entropy method for analytic continuation
We present Maxent, a tool for performing analytic continuation of spectral functions using the
maximum entropy method. The code operates on discrete imaginary axis datasets (values …
maximum entropy method. The code operates on discrete imaginary axis datasets (values …