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  Nonequilibrium self-energy functional approach to the dynamical Mott transition

Hofmann, F., Eckstein, M., & Potthoff, M. (2016). Nonequilibrium self-energy functional approach to the dynamical Mott transition. Physical Review B, 93(23): 235104. doi:10.1103/PhysRevB.93.235104.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-F428-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-9182-4
Genre: Journal Article

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PhysRevB.93.235104.pdf (Publisher version), 2MB
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2016
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http://dx.doi.org/10.1103/PhysRevB.93.235104 (Publisher version)
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https://arxiv.org/abs/1603.07177 (Preprint)
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 Creators:
Hofmann, Felix1, Author
Eckstein, Martin2, 3, Author              
Potthoff, Michael1, Author
Affiliations:
1I. Institute of Theoretical Physics, University of Hamburg, 20355 Hamburg, Germany, ou_persistent22              
2Theory 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              
3University of Hamburg-CFEL, 22761 Hamburg, Germany, ou_persistent22              

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 Abstract: The real-time dynamics of the Fermi-Hubbard model, driven out of equilibrium by quenching or ramping the interaction parameter, is studied within the framework of the nonequilibrium self-energy functional theory. A dynamical impurity approximation with a single auxiliary bath site is considered as a reference system, and the time-dependent hybridization is optimized as prescribed by the variational principle. The dynamical two-site approximation turns out to be useful to study the real-time dynamics on short and intermediate time scales. Depending on the strength of the interaction in the final state, two qualitatively different response regimes are observed. For both weak and strong couplings, qualitative agreement with previous results of nonequilibrium dynamical mean-field theory is found. The two regimes are sharply separated by a critical point at which the low-energy bath degree of freedom decouples in the course of time. We trace the dependence of the critical interaction of the dynamical Mott transition on the duration of the interaction ramp from sudden quenches to adiabatic dynamics and therewith link the dynamical to the equilibrium Mott transition.

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Language(s): eng - English
 Dates: 2016-05-172016-03-232016-06-022016-06-15
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevB.93.235104
arXiv: 1603.07177
 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: 93 (23) Sequence Number: 235104 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008