Chebyshev Matrix Product State Impurity Solver for the Dynamical Mean-Field Theory
arXiv:1407.1622 · doi:10.1103/PhysRevB.90.115124
Abstract
We compute the spectral functions for the two-site dynamical cluster theory and for the two-orbital dynamical mean-field theory in the density-matrix renormalization group (DMRG) framework using Chebyshev expansions represented with matrix product states (MPS). We obtain quantitatively precise results at modest computational effort through technical improvements regarding the truncation scheme and the Chebyshev rescaling procedure. We furthermore establish the relation of the Chebyshev iteration to real-time evolution, and discuss technical aspects as computation time and implementation in detail.
20 pages, 12 figures
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- Generalized Schrieffer-Wolff transformation of multi-flavor Hubbard models
- Magnetic field-dependent dynamics and field-driven metal-to-insulator transition of the half-filled Hubbard model: A DMFT+DMRG study
- The Nonequilibrium Many-Body Problem as a paradigm for extreme data science