Enhanced pairing susceptibility in a photodoped two-orbital Hubbard model

Philipp Werner, Hugo U. R. Strand, Shintaro Hoshino, Yuta Murakami, and Martin Eckstein
Phys. Rev. B 97, 165119 – Published 11 April 2018

Abstract

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.

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  • Received 22 January 2018
  • Revised 3 April 2018

DOI:https://doi.org/10.1103/PhysRevB.97.165119

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Philipp Werner1, Hugo U. R. Strand2,3, Shintaro Hoshino4, Yuta Murakami1, and Martin Eckstein5

  • 1Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland
  • 2Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
  • 3Center for Computational Quantum Physics, Flatiron Institute, 162 Fifth Avenue, New York, New York 10010, USA
  • 4Department of Physics, Saitama University, Saitama 338-8570, Japan
  • 5Department of Physics, University of Erlangen-Nürnberg, 91058 Erlangen, Germany

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Issue

Vol. 97, Iss. 16 — 15 April 2018

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