Journal article

Enhanced pairing susceptibility in a photodoped two-orbital Hubbard model

  • Werner, Philipp Department of Physics, University of Fribourg, Switzerland
  • Strand, Hugo U. R. Department of Quantum Matter Physics, University of Geneva, Switzerland - Center for Computational Quantum Physics, Flatiron Institute, New York, USA
  • Hoshino, Shintaro Department of Physics, Saitama University, Japan
  • Murakami, Yuta Department of Physics, University of Fribourg, Switzerland
  • Eckstein, Martin Department of Physics, University of Erlangen-Nürnberg, Germany
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Published in:
  • Physical Review B. - 2018, vol. 97, no. 16, p. 165119
English Local spin fluctuations provide the glue for orbital-singlet spin-triplet pairing in the doped Mott insulating regime of multiorbital Hubbard models. At large Hubbard repulsion U, the pairing susceptibility is nevertheless tiny because the pairing interaction cannot overcome the suppression of charge fluctuations. Using nonequilibrium dynamical mean field simulations of the two-orbital Hubbard model, we show that out of equilibrium the pairing susceptibility in this large-U regime can be strongly enhanced by creating a photoinduced population of the relevant charge states. This enhancement is supported by the long lifetime of photodoped charge carriers and a built-in cooling mechanism in multiorbital Hubbard systems.
Faculté des sciences et de médecine
Département de Physique
  • English
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