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  Ultra-fast photo-carrier relaxation in Mott insulators with short-range spin correlations

Eckstein, M., & Werner, P. (2016). Ultra-fast photo-carrier relaxation in Mott insulators with short-range spin correlations. Scientific Reports, 6: 21235. doi:10.1038/srep21235.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-30A9-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-C68D-9
Genre: Journal Article

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© M. Eckstein and P. Werner

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http://arxiv.org/abs/1410.3956 (Preprint)
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 Creators:
Eckstein, Martin1, 2, Author              
Werner, Philipp3, 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              
3Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland, ou_persistent22              

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Free keywords: Condensed Matter; Strongly Correlated Electrons; Electronic properties and materials; Magnetic properties and materials
 Abstract: Ultra-fast spectroscopy can reveal the interplay of charges with low energy degrees of freedom, which underlies the rich physics of correlated materials. As a potential glue for superconductivity, spin fluctuations in Mott insulators are of particular interest. A theoretical description of the coupled spin and charge degrees of freedom is challenging, because magnetic order is often only short-lived and short-ranged. In this work we theoretically investigate how the spin-charge interactions influence the relaxation of a two-dimensional Mott-Hubbard insulator after photo-excitation. We use a nonequilibrium variant of the dynamical cluster approximation, which, in contrast to single-site dynamical mean-field theory, captures the effect of short-range correlations. The relaxation time is found to scale with the strength of the nearest-neighbor spin correlations, and can be 10–20 fs in the cuprates. Increasing the temperature or excitation density decreases the spin correlations and thus implies longer relaxation times. This may help to distinguish the effect of spin-fluctuations on the charge relaxation from the influence of other bosonic modes in the solid.

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Language(s): eng - English
 Dates: 2014-10-152014-10-212016-01-142016-02-17
 Publication Status: Published online
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1410.3956
DOI: 10.1038/srep21235
 Degree: -

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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 6 Sequence Number: 21235 Start / End Page: - Identifier: Other: 2045-2322
CoNE: /journals/resource/2045-2322