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  Coexistence of excited polarons and metastable delocalized states in photoinduced metals

Sayyad, S., & Eckstein, M. (2015). Coexistence of excited polarons and metastable delocalized states in photoinduced metals. Physical Review B, 91(10): 104301. doi:10.1103/PhysRevB.91.104301.

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PhysRevB.91.104301.pdf (Publisher version), 2MB
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PhysRevB.91.104301.pdf
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2015
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http://dx.doi.org/10.1103/PhysRevB.91.104301 (Publisher version)
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 Creators:
Sayyad, Sharareh1, 2, Author              
Eckstein, Martin1, 2, Author              
Affiliations:
1Theory of Correlated Systems out of Equilibrium, Research Groups, Max Planck Research Department for Structural Dynamics, Department of Physics, University of Hamburg, External Organizations, ou_2173641              
2CFEL, 22761 Hamburg, Germany, ou_persistent22              

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Free keywords: PACS number: 71.10.Fd
 Abstract: We study how polaronic states form as a function of time due to strong electron-phonon coupling, starting from a hot electron distribution which is representative of a photoinduced metallic state immediately after laser excitation. For this purpose we provide the exact solution of the single-electron Holstein model within nonequilibrium dynamical mean-field theory. In particular, this allows us to reveal key features of the transient metallic state in the numerically most challenging regime, the adiabatic regime, in which phonon frequencies are smaller than the electronic bandwidth: Initial coherent phonon oscillations are strongly damped, leaving the system in a mixture of excited polaron states and metastable delocalized states. We compute the time-resolved photoemission spectrum, which makes it possible to disentangle two contributions. The existence of long-lived delocalized states suggests ways to externally control transient properties of photodoped metals.

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Language(s): eng - English
 Dates: 2014-10-142015-03-032015-03-01
 Publication Status: Published in print
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.91.104301
 Degree: -

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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: 91 (10) Sequence Number: 104301 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008