A numerically exact study of Weyl superconductivity
Abstract
We study the interplay of interactions and topology in a pseudo-spin 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 pseudo-spin plays a key role in the pairing mechanism, and its effect is reflected 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 pseudo-spin singlet and pseudo-spin triplet. Our results provide a detailed characterization of the exotic pairing behavior in this system, and represent an important step towards 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.
Cite
@article{arxiv.1907.03804,
title = {A numerically exact study of Weyl superconductivity},
author = {Peter Rosenberg and Niraj Aryal and Efstratios Manousakis},
journal= {arXiv preprint arXiv:1907.03804},
year = {2019}
}