Staggered ordered phases in the three-orbital Hubbard model
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Ishigaki, Kosuke
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo, Japan
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Nasu, Joji
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo, Japan
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Koga, Akihisa
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo, Japan
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Hoshino, Shintaro
Department of Physics, Saitama University, Saitama, Japan
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Werner, Philipp
Department of Physics, University of Fribourg, Switzerland
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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.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/307698
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