217 citations · 627 across the 18 of their papers we have counts for
6 papers · 1 filter
Stability and complexity of global iterative solvers for the Kadanoff-Baym equations
Jože Gašperlin, Denis Golež, Jason Kaye
Although the Kadanoff-Baym equations are typically solved using time-stepping methods, iterative global-in-time solvers offer potential algorithmic advantages, particularly when co…
Decomposing imaginary time Feynman diagrams using separable basis functions: Anderson impurity model strong coupling expansion
Jason Kaye, Zhen Huang, Hugo U. R. Strand +1
We present a deterministic algorithm for the efficient evaluation of imaginary time diagrams based on the recently introduced discrete Lehmann representation (DLR) of imaginary tim…
Low rank Green's function representations applied to dynamical mean-field theory
Nan Sheng, Alexander Hampel, Sophie Beck +4
Several recent works have introduced highly compact representations of single-particle Green's functions in the imaginary time and Matsubara frequency domains, as well as efficient…
Automatic, high-order, and adaptive algorithms for Brillouin zone integration
Jason Kaye, Sophie Beck, Alex Barnett +2
We present efficient methods for Brillouin zone integration with a non-zero but possibly very small broadening factor , focusing on cases in which downfolded Hamiltonians can be…
Learning Feynman Diagrams with Tensor Trains
Yuriel Nunez-Fernandez, Matthieu Jeannin, Philipp T. Dumitrescu +4
We use tensor network techniques to obtain high order perturbative diagrammatic expansions for the quantum many-body problem at very high precision. The approach is based on a tens…
Low rank compression in the numerical solution of the nonequilibrium Dyson equation
Jason Kaye, Denis Golež
We propose a method to improve the computational and memory efficiency of numerical solvers for the nonequilibrium Dyson equation in the Keldysh formalism. It is based on the empir…