Journal
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
Volume 227, Issue 15-16, Pages 1939-1948Publisher
SPRINGER HEIDELBERG
DOI: 10.1140/epjst/e2018-800054-3
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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.
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