Journal article

Long-range orders and spin/orbital freezing in the two-band Hubbard model

  • Steiner, Karim Department of Physics, University of Fribourg, Switzerland
  • Hoshino, Shintaro Department of Basic Science, The University of Tokyo, Meguro, Tokyo, Japan
  • Nomura, Yusuke Centre de Physique Théorique, École Polytechnique, Centre National de la Recherche Scientifique, Université Paris-Saclay, Palaiseau, France
  • Werner, Philipp Department of Physics, University of Fribourg, Switzerland
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Published in:
  • Physical Review B. - 2016, vol. 94, no. 7, p. 075107
English We solve the orbitally degenerate two-band Hubbard model within dynamical mean field theory and map out the instabilities to various symmetry-broken phases based on an analysis of the corresponding lattice susceptibilities. Phase diagrams as a function of the Hund coupling parameter J are obtained both for the model with rotationally invariant interaction and for the model with Ising-type anisotropy. For negative J, an intraorbital spin-singlet superconducting phase appears at low temperatures, while the normal state properties are characterized by an orbital-freezing phenomenon. This is the negative-J analog of the recently discovered fluctuating-moment induced s-wave spin-triplet superconductivity in the spin-freezing regime of multiorbital models with J>0.
Faculté des sciences et de médecine
Département de Physique
  • English
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