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  Relaxation dynamics of the Kondo lattice model

Werner, P., & Eckstein, M. (2012). Relaxation dynamics of the Kondo lattice model. Physical Review B, 86(4): 045119. doi:10.1103/PhysRevB.86.045119.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-1620-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-469F-9
Genre: Journal Article

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PhysRevB.86.045119.pdf (Publisher version), 2MB
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2012
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http://dx.doi.org/10.1103/PhysRevB.86.045119 (Publisher version)
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http://arxiv.org/abs/1204.5418 (Preprint)
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 Creators:
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, Research Groups, Max Planck Research Department for Structural Dynamics, Department of Physics, University of Hamburg, External Organizations, ou_2173641              
3CFEL, Hamburg, Germany, ou_persistent22              

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Free keywords: PACS numbers: 71.10.Fd, 71.27.+a
 Abstract: We study the relaxation properties of the Kondo lattice model using the nonequilibrium dynamical mean-field formalism in combination with the noncrossing approximation. The system is driven out of equilibrium either by a magnetic field pulse, which perturbs the local singlets, or by a sudden quench of the Kondo coupling. For relaxation processes close to thermal equilibrium (after a weak perturbation), the relaxation time increases substantially as one crosses from the local moment regime into the heavy Fermi liquid. A strong perturbation, which injects a large amount of energy, can rapidly transform the heavy Fermi liquid into a local moment state. Upon cooling, the heavy Fermi liquid reappears in a two-stage relaxation, where the first step opens the Kondo gap and the second step corresponds to a slow approach of the equilibrium state via a nonthermal pathway.

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Language(s): eng - English
 Dates: 2012-04-262012-07-162012-07-15
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevB.86.045119
arXiv: 1204.5418
 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: 86 (4) Sequence Number: 045119 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008