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  Ultrafast and reversible control of the exchange interaction in Mott insulators

Mentink, J., Balzer, K., & Eckstein, M. (2015). Ultrafast and reversible control of the exchange interaction in Mott insulators. Nature Communications, 6: 6708. doi:10.1038/ncomms7708.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-A1EF-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-F6A4-7
Genre: Journal Article

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ncomms7708.pdf (Publisher version), 866KB
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2015
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Macmillan Publishers Limited. All rights reserved.

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http://dx.doi.org/10.1038/ncomms7708 (Publisher version)
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http://arxiv.org/abs/1407.4761 (Preprint)
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 Creators:
Mentink, Johan1, Author              
Balzer, Karsten1, Author              
Eckstein, Martin1, Author              
Affiliations:
1Theory 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              

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Free keywords: Physical sciences; Theoretical physics; Condensed matter
 Abstract: The strongest interaction between microscopic spins in magnetic materials is the exchange interaction Jex. Therefore, ultrafast control of Jex holds the promise to control spins on ultimately fast timescales. We demonstrate that time-periodic modulation of the electronic structure by electric fields can be used to reversibly control Jex on ultrafast timescales in extended antiferromagnetic Mott insulators. In the regime of weak driving strength, we find that Jex can be enhanced and reduced for frequencies below and above the Mott gap, respectively. Moreover, for strong driving strength, even the sign of Jex can be reversed and we show that this causes time reversal of the associated quantum spin dynamics. These results suggest wide applications, not only to control magnetism in condensed matter systems, for example, via the excitation of spin resonances, but also to assess fundamental questions concerning the reversibility of the quantum many-body dynamics in cold atom systems.

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Language(s): eng - English
 Dates: 2014-06-262015-02-192015-03-30
 Publication Status: Published online
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/ncomms7708
arXiv: 1407.4761
 Degree: -

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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 6 Sequence Number: 6708 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: /journals/resource/2041-1723