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  Comparing the generalized Kadanoff-Baym ansatz with the full Kadanoff-Baym equations for an excitonic insulator out of equilibrium

Tuovinen, R., Golež, D., Eckstein, M., & Sentef, M. A. (2020). Comparing the generalized Kadanoff-Baym ansatz with the full Kadanoff-Baym equations for an excitonic insulator out of equilibrium. Physical Review B, 102(11): 115157. doi:10.1103/PhysRevB.102.115157.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-C9E4-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-15A4-8
Genre: Journal Article

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PhysRevB.102.115157.pdf (Publisher version), 2MB
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PhysRevB.102.115157.pdf
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Open Access. - Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
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https://arxiv.org/abs/2007.07801 (Preprint)
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https://dx.doi.org/10.1103/PhysRevB.102.115157 (Publisher version)
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 Creators:
Tuovinen, R.1, Author
Golež, D.2, Author
Eckstein, M.3, Author
Sentef, M. A.4, Author              
Affiliations:
1QTF Centre of Excellence, Turku Centre for Quantum Physics, Department of Physics and Astronomy, University of Turku, ou_persistent22              
2Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              
3Department of Physics, University of Erlangen-Nürnberg, ou_persistent22              
4Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              

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 Abstract: We investigate out-of-equilibrium dynamics in an excitonic insulator (EI) with a finite-momentum pairing perturbed by a laser-pulse excitation and a sudden coupling to fermionic baths. The transient dynamics of the excitonic order parameter is resolved using the full nonequilibrium Green's function approach and the generalized Kadanoff-Baym ansatz (GKBA) within the second-order Born approximation. The comparison between the two approaches after a laser-pulse excitation shows a good agreement in the weak and the intermediate photodoping regime. In contrast, the laser-pulse dynamics resolved by the GKBA does not show a complete melting of the excitonic order after a strong excitation. Instead we observe persistent oscillations of the excitonic order parameter with a predominant frequency given by the renormalized equilibrium band gap. This anomalous behavior can be overcome within the GKBA formalism by coupling to an external bath, which leads to a transition of the EI system toward the normal state. We analyze the long-time evolution of the system and distinguish decay timescales related to dephasing and thermalization.

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Language(s): eng - English
 Dates: 2020-09-012020-07-152020-09-022020-09-282020-09-15
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: arXiv: 2007.07801
DOI: 10.1103/PhysRevB.102.115157
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 102 (11) Sequence Number: 115157 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008