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Functional renormalization of spinless triangular-lattice fermions: N-patch vs. truncated-unity scheme

Author

Listed:
  • Nico Gneist

    (University of Cologne)

  • Dominik Kiese

    (University of Cologne)

  • Ravn Henkel

    (University of Cologne)

  • Ronny Thomale

    (University of Würzburg)

  • Laura Classen

    (Max Planck Institute for Solid State Research)

  • Michael M. Scherer

    (Ruhr-University Bochum)

Abstract

We study competing orders of spinless fermions in the triangular-lattice Hubbard model with nearest-neighbor interaction. We calculate the effective, momentum-resolved two-particle vertex in an unbiased way in terms of the functional renormalization group method and compare two different schemes for the momentum discretization, one based on dividing the Fermi surface into patches and one based on a channel decomposition. We study attractive and repulsive nearest-neighbor interaction and find a competition of pairing and charge instabilities. In the attractive case, a Pomeranchuk instability occurs at Van Hove filling and f-wave and p-wave pairing emerge when the filling is reduced. In the repulsive case, we obtain a charge density wave at Van Hove filling and extended p-wave pairing with reduced filling. The p-wave pairing solution is doubly degenerate and can realize chiral $$p+ip$$ p + i p superconductivity with different Chern numbers in the ground state. We discuss implications for strongly correlated spin-orbit coupled hexagonal electron systems such as moiré heterostructures. Graphic Abstract

Suggested Citation

  • Nico Gneist & Dominik Kiese & Ravn Henkel & Ronny Thomale & Laura Classen & Michael M. Scherer, 2022. "Functional renormalization of spinless triangular-lattice fermions: N-patch vs. truncated-unity scheme," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 95(9), pages 1-16, September.
    • Handle: RePEc:spr:eurphb:v:95:y:2022:i:9:d:10.1140_epjb_s10051-022-00395-w
    DOI: 10.1140/epjb/s10051-022-00395-w
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    Cited by:

    1. Carsten Honerkamp & Dante M. Kennes & Volker Meden & Michael M. Scherer & Ronny Thomale, 2022. "Recent developments in the functional renormalization group approach to correlated electron systems," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 95(12), pages 1-3, December.

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