Adiabatic Preparation of a Correlated Symmetry-Broken Initial State with the Generalized Kadanoff–Baym Ansatz

Tuovinen R, Golež D, Schüler M, Werner P, Eckstein M, Sentef MA (2019)

Publication Type: Journal article

Publication year: 2019

Journal

physica status solidi (b) Wiley

Book Volume: 256

Article Number: 1800469

Journal Issue: 7

DOI: 10.1002/pssb.201800469

Abstract

A fast time propagation method for nonequilibrium Green's functions (NEGF) based on the generalized Kadanoff–Baym Ansatz (GKBA) is applied to a lattice system with a symmetry-broken equilibrium phase, namely an excitonic insulator (EI). The adiabatic preparation of a correlated symmetry-broken initial state from a Hartree–Fock wave function within GKBA is assessed by comparing with a solution of the imaginary-time Dyson equation. It is found that it is possible to reach a symmetry-broken correlated initial state with nonzero excitonic order parameter by the adiabatic switching (AS) procedure. It is discussed under which circumstances this is possible in practice within reasonably short switching times.

Authors with CRIS profile

Martin Eckstein Lehrstuhl für Theoretische Festkörperphysik

Involved external institutions

University of Fribourg / Universitè de Fribourg CH Switzerland (CH) Max-Planck-Instituts für Struktur und Dynamik der Materie (MPSD) / Max Planck Institute for the Structure and Dynamics of Matter DE Germany (DE)

How to cite

APA:

Tuovinen, R., Golež, D., Schüler, M., Werner, P., Eckstein, M., & Sentef, M.A. (2019). Adiabatic Preparation of a Correlated Symmetry-Broken Initial State with the Generalized Kadanoff–Baym Ansatz. physica status solidi (b), 256(7). https://dx.doi.org/10.1002/pssb.201800469

MLA:

Tuovinen, Riku, et al. "Adiabatic Preparation of a Correlated Symmetry-Broken Initial State with the Generalized Kadanoff–Baym Ansatz." physica status solidi (b) 256.7 (2019).

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