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  Photoinduced gap closure in an excitonic insulator

Golež, D., Werner, P., & Eckstein, M. (2016). Photoinduced gap closure in an excitonic insulator. Physical Review B, 94(3): 035121. doi:10.1103/PhysRevB.94.035121.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-553D-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-0178-9
Genre: Journal Article

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 Creators:
Golež, Denis1, Author
Werner, Philipp1, Author
Eckstein, Martin2, 3, Author              
Affiliations:
1Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland, ou_persistent22              
2Theory of Correlated Systems out of Equilibrium, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938296              
3University of Hamburg-CFEL, 22761 Hamburg, Germany, ou_persistent22              

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Free keywords: Condensed Matter; Strongly Correlated Electrons; PACS numbers: 05.70.Ln, 71.35.Lk,72.15.-v
 Abstract: We study the dynamical phase transition out of an excitonic insulator phase after photoexcitation using a time-dependent extension of the self-consistent GW method. We connect the evolution of the photoemission spectra to the dynamics of the excitonic order parameter and identify two dynamical phase transition points marked by a slowdown in the relaxation: one critical point is connected with the trapping in a nonthermal state with reduced exciton density and the second corresponds to the thermal phase transition. The transfer of kinetic energy from the photoexcited carriers to the exciton condensate is shown to be the main mechanism for the gap melting. We analyze the low energy dynamics of screening, which strongly depends on the presence of the excitonic gap, and argue that it is difficult to interpret the static component of the screened interaction as the effective interaction of some low energy model. Instead we propose a phenomenological measure for the effective interaction which indicates that screening has minor effects on the low energy dynamics.

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Language(s): eng - English
 Dates: 2016-04-132016-04-142016-07-112016-07-15
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1604.03784
DOI: 10.1103/PhysRevB.94.035121
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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: 94 (3) Sequence Number: 035121 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008