A weak-coupling tensor cross interpolation impurity solver for nonequilibrium DMFT approximates integrands in tensor-train form to mitigate the sign problem, matching exact benchmarks and reproducing thermalization in the Hubbard model.
Nonequilibrium dynamical mean-field theory of a strongly correlated system
1 Pith paper cite this work. Polarity classification is still indexing.
1
Pith paper citing it
abstract
We present a generalized dynamical mean-field approach for the nonequilibrium physics of a strongly correlated system in the presence of a time-dependent external field. The Keldysh Green's function formalism is used to study the nonequilibrium problem. We derive a closed set of self-consistency equations in the case of a driving field with frequency Omega and wave vector q. We present numerical results for the local frequency-dependent Green's function and the self-energy for different values of the field amplitude in the case of a uniform external field using the iterated perturbation theory. In addition, an expression for the frequency-dependent optical conductivity of the Hubbard model with a driving external field is derived.
fields
cond-mat.str-el 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
citing papers explorer
-
Weak-coupling tensor cross interpolation impurity solver for nonequilibrium dynamical mean-field theory
A weak-coupling tensor cross interpolation impurity solver for nonequilibrium DMFT approximates integrands in tensor-train form to mitigate the sign problem, matching exact benchmarks and reproducing thermalization in the Hubbard model.