Journal article

Adiabatic preparation of a correlated symmetry‐broken initial state with the generalized Kadanoff–Baym Ansatz

  • Tuovinen, Riku Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
  • Golež, Denis Department of Physics, University of Fribourg, Switzerland
  • Schüler, Michael Department of Physics, University of Fribourg, Switzerland
  • Werner, Philipp Department of Physics, University of Fribourg, Switzerland
  • Eckstein, Martin Department of Physics, University of Erlangen–Nürnberg, Erlangen, Germany
  • Sentef, Michael A. Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
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    2019
Published in:
  • physica status solidi (b). - 2019, vol. 256, no. 7, p. 1800469
English 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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/308129
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