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  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, M. A. (2019). Adiabatic Preparation of a Correlated Symmetry‐Broken Initial State with the Generalized Kadanoff–Baym Ansatz. Physica Status Solidi B, 256(7): 1800469. doi:10.1002/pssb.201800469.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E294-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-A7FC-4
Genre: Journal Article

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https://arxiv.org/abs/1808.00712 (Preprint)
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https://dx.doi.org/10.1002/pssb.201800469 (Publisher version)
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 Creators:
Tuovinen, R.1, Author              
Golež, D.2, Author
Schüler, M.2, Author
Werner, P.2, Author
Eckstein, M.3, Author
Sentef, M. A.1, Author              
Affiliations:
1Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              
2Department of Physics, University of Fribourg, ou_persistent22              
3Department of Physics, University of Erlangen–Nürnberg, ou_persistent22              

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Free keywords: nonequilibrium Green’s function, time propagation, generalized Kadanoff–Baym Ansatz, excitonic insulator
 Abstract: A fast time propagation method for nonequilibrium Green's functions based on the generalized Kadanoff--Baym Ansatz (GKBA) is applied to a lattice system with a symmetry-broken equilibrium phase, namely an excitonic insulator. 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. We find that it is possible to reach a symmetry-broken correlated initial state with nonzero excitonic order parameter by the adiabatic switching procedure. We discuss under which circumstances this is possible in practice within reasonably short switching times.

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Language(s): eng - English
 Dates: 2018-10-242018-09-062018-12-032019-07
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1808.00712
DOI: 10.1002/pssb.201800469
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Project name : R.T. and M.A.S. acknowledge funding by the DFG (Grant No. SE 2558/2-1) through the Emmy Noether program. D.G. and M.S. were supported by the Swiss National Science Foundation through Grant No. 200021_165539 and ERC Consolidator Grant 724103. M.E. acknowledges funding by the ERC Starting Grant 716648. We wish to thank Daniel Karlsson for productive discussions.
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Title: Physica Status Solidi B
  Abbreviation : Phys. Status Solidi B
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 256 (7) Sequence Number: 1800469 Start / End Page: - Identifier: ISSN: 0370-1972
CoNE: https://pure.mpg.de/cone/journals/resource/958480240330