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  Role of impact ionization in the thermalization of photoexcited Mott insulators

Werner, P., Held, K., & Eckstein, M. (2014). Role of impact ionization in the thermalization of photoexcited Mott insulators. Physical Review B, 90(23): 235102. doi:10.1103/PhysRevB.90.235102.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0028-16A6-5 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0028-2E83-5
Genre: Journal Article

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PhysRevB.90.235102.pdf (Publisher version), 720KB
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http://dx.doi.org/10.1103/PhysRevB.90.235102 (Publisher version)
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http://arxiv.org/abs/1408.3425 (Preprint)
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 Creators:
Werner, Philipp1, Author
Held, Karsten2, Author
Eckstein, Martin3, 4, Author           
Affiliations:
1Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland, ou_persistent22              
2Institut for Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria, ou_persistent22              
3Theory 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              
4CFEL, Hamburg, Germany, ou_persistent22              

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Free keywords: PACS number: 71.10.Fd
 Abstract: We study the influence of the pulse energy and fluence on the thermalization of photodoped Mott insulators. If the Mott gap is smaller than the width of the Hubbard bands, the kinetic energy of individual carriers can be large enough to produce additional doublon-hole pairs via a process analogous to impact ionization. The thermalization dynamics, which involves an adjustment of the doublon and hole densities, thus changes as a function of the energy of the photo-doped carriers and exhibits two time scales: a fast relaxation related to the impact ionization of high-energy carriers and a slower time scale associated with higher-order scattering processes. The slow dynamics depends more strongly on the gap size and the photodoping concentration.

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Language(s): eng - English
 Dates: 2014-11-152014-08-172014-12-012014-12-15
 Publication Status: Issued
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.90.235102
arXiv: 1408.3425
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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: 90 (23) Sequence Number: 235102 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008