Numerically exact study of Weyl superconductivity

Peter Rosenberg, Niraj Aryal, and Efstratios Manousakis
Phys. Rev. B 100, 104522 – Published 20 September 2019

Abstract

We study the interplay of interactions and topology in a pseudospin Weyl system, obtained from a minimally modified Hubbard model, using the numerically exact auxiliary-field quantum Monte Carlo method complemented by mean-field theory. We find that the pseudospin plays a key role in the structure of the pairing amplitude. An attractive on-site interaction leads to pairing between quasiparticles carrying opposite spin and opposite topological charge, resulting in the formation of real-spin singlet pairs that are a mixture of pseudospin singlet and pseudospin triplet. Our results provide a detailed characterization of the exotic pairing behavior in this system, and they represent an important step toward a more complete understanding of superconductivity in the context of topological band structures, which will help guide searches for topological superconductivity in real materials and ultracold atoms.

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  • Received 3 July 2019
  • Revised 30 August 2019

DOI:https://doi.org/10.1103/PhysRevB.100.104522

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Peter Rosenberg1, Niraj Aryal1, and Efstratios Manousakis1,2

  • 1National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
  • 2Department of Physics, University of Athens, Panepistimioupolis, Zografos, 157 84 Athens, Greece

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Issue

Vol. 100, Iss. 10 — 1 September 2019

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