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  Nonequilibrium dynamical cluster approximation study of the Falicov-Kimball model

Herrmann, A. J., Tsuji, N., Eckstein, M., & Werner, P. (2016). Nonequilibrium dynamical cluster approximation study of the Falicov-Kimball model. Physical Review B, 94(24): 245114. doi:10.1103/PhysRevB.94.245114.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-8499-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E203-C
Genre: Journal Article

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 Creators:
Herrmann, Andreas J.1, Author
Tsuji, Naoto2, Author
Eckstein, Martin3, 4, Author              
Werner, Philipp1, Author
Affiliations:
1Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland, ou_persistent22              
2RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan, ou_persistent22              
3Theory 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              
4University of Hamburg-CFEL, 22761 Hamburg, Germany, ou_persistent22              

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Free keywords: Condensed Matter; Strongly Correlated Electrons; PACS number: 71.10.Fd
 Abstract: We use a nonequilibrium implementation of the dynamical cluster approximation (DCA) to study the effect of short-range correlations on the dynamics of the two-dimensional Falicov-Kimball model after an interaction quench. As in the case of single-site dynamical mean field theory, thermalization is absent in DCA simulations, and for quenches across the metal-insulator boundary, nearest-neighbor charge correlations in the nonthermal steady state are found to be larger than in the thermal state with identical energy. We investigate to what extent it is possible to define an effective temperature of the trapped state after a quench. Based on the ratio between the lesser and retarded Green's function we conclude that a roughly thermal distribution is reached within the energy intervals corresponding to the momentum-patch dependent subbands of the spectral function. The effectively different chemical potentials of these distributions however lead to a very hot, or even negative, effective temperature in the energy intervals between these subbands.

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Language(s): eng - English
 Dates: 2016-09-162016-12-062016-12-06
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: arXiv: 1609.04708
DOI: 10.1103/PhysRevB.94.245114
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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: 94 (24) Sequence Number: 245114 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008