A causality-based divide-and-conquer algorithm for nonequilibrium Green’s function calculations with quantics tensor trains
Abstract
We propose a causality-based divide-and-conquer algorithm for nonequilibrium Green’s function calculations with quantics tensor trains. This algorithm enables stable and efficient extensions of the simulated time domain by exploiting the causality of Green’s functions. We apply this approach within the framework of nonequilibrium dynamical mean-field theory to the simulation of quench dynamics in symmetry-broken phases, where long-time simulations are often required to capture slow relaxation dynamics. We demonstrate that our algorithm allows to extend the simulated time domain without a significant increase in the cost of storing the Green’s function.
Fields of Study & Subjects
Quantum many-body systems
Block Copolymer Self-Assembly
Advanced Thermodynamics and Statistical Mechanics
Publication details
- Journal / source
- SciPost Physics
- Publisher
- Stichting SciPost
- Volume
- 20
- Issue
- 3
- Publication date
- 9 March 2026
- Language
- EN