Superfluidity and density order in a bilayer extended Hubbard model

Tuomas I. Vanhala, Jildou E. Baarsma, Miikka O. J. Heikkinen, Matthias Troyer, Ari Harju, and Päivi Törmä
Phys. Rev. B 91, 144510 – Published 23 April 2015

Abstract

We use cellular dynamical mean-field theory to study the phase diagram of the square lattice bilayer Hubbard model with an interlayer interaction. The layers are populated by two-component fermions, and the densities in both layers and the strength of the interactions are varied. We find that an attractive interlayer interaction can induce a checkerboard density-ordered phase and superfluid phases, with either interlayer or intralayer pairing. Remarkably, the latter phase does not require an intralayer interaction to be present: it can be attributed to an induced attractive interaction caused by density fluctuations in the other layer.

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  • Received 13 November 2014
  • Revised 23 March 2015

DOI:https://doi.org/10.1103/PhysRevB.91.144510

©2015 American Physical Society

Authors & Affiliations

Tuomas I. Vanhala1, Jildou E. Baarsma1, Miikka O. J. Heikkinen1, Matthias Troyer2, Ari Harju1, and Päivi Törmä1,*

  • 1COMP Centre of Excellence, Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland
  • 2Theoretische Physik, ETH Zurich, 8093 Zurich, Switzerland

  • *paivi.torma@aalto.fi

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Vol. 91, Iss. 14 — 1 April 2015

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