https://doi.org/10.1140/epjst/e2018-800054-3
Regular Article
Initial correlated states for the generalized Kadanoff–Baym Ansatz without adiabatic switching-on of interactions in closed systems
Department of Physics and European Theoretical Spectroscopy Facility (ETSF), Lund University,
P.O. Box 118,
221 00 Lund, Sweden
a e-mail: claudio.verdozzi@teorfys.lu.se
Received:
13
April
2018
Received in final form:
18
June
2018
Published online: 18 January 2019
We reconsider the Generalized Kadanoff–Baym Ansatz (GKBA) approximation for non-equilibrium Green’s functions and extend it to self-consistently define an equilibrium correlated (within GKBA) state in closed systems. The advantage of the proposed prescription is to avoid the preparation of the initial equilibrium correlated state via adiabatic switching-on of the correlations. A simple model system, namely a Hubbard-dimer, is used to illustrate aspects of the computational implementation and performance of the new scheme.
© The Author(s) 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
