Journal article

Staggered ordered phases in the three-orbital Hubbard model

  • Ishigaki, Kosuke Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo, Japan
  • Nasu, Joji Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo, Japan
  • Koga, Akihisa Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo, Japan
  • Hoshino, Shintaro Department of Physics, Saitama University, Saitama, Japan
  • Werner, Philipp Department of Physics, University of Fribourg, Switzerland
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    2019
Published in:
  • Physical Review B. - 2019, vol. 99, no. 8, p. 085131
English We study ordered phases with broken translational symmetry in the half-filled three- orbital Hubbard model with antiferromagnetic Hund coupling by means of dynamical mean-field theory (DMFT) and continuous-time quantum Monte Carlo simulations. The stability regions of the antiferro-orbital (AFO), antiferromagnetic (AFM), and charge density wave (CDW) states are determined by measuring the corresponding order parameters. We introduce two symmetrically distinct AFO order parameters and show that these are the primary order parameters in the phase diagram. The CDW and AFM states appear simultaneously with these two types of AFO orders in the weak and strong coupling region, respectively. The DMFT phase diagram is consistent with the results obtained by the Hartree approximation and strong-coupling perturbation theory. In the weak coupling regime, a nontrivial exponent β=3/2 is found for the CDW order parameter, which is related to the coupling between the CDW and AFO orders in the Landau theory characteristic for the three-orbital model. We also demonstrate the existence of a metallic AFO state without any charge disproportions and magnetic orders, which appears only at finite temperatures.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/307698
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