Magnetic-field induced triplet superconductivity in the Hubbard model on a triangular lattice

TL;DR

This paper theoretically demonstrates that a magnetic field can induce spin-triplet superconductivity in a low-density Hubbard model on a triangular lattice with strong ferromagnetic fluctuations, confirmed via advanced computational methods.

Contribution

It introduces a novel mechanism for magnetic-field-induced triplet superconductivity in a specific lattice model, supported by quantum Monte-Carlo and dynamical cluster approximation calculations.

Findings

Magnetic field can induce triplet pairing in the Hubbard model.

Triplet superconductivity is linked to ferromagnetic spin fluctuations.

Confirmation through quantum Monte-Carlo simulations.

Abstract

We propose theoretically that a magnetic field can realize spin-triplet superconductivity in repulsively interacting electron systems having strong ferromagnetic spin fluctuations. We confirm the general idea for the low-density Hubbard model on a triangular lattice, whose Fermi surface consists of disconnected pieces, by calculating the pairing susceptibility in a moderate magnetic field with the quantum Monte-Carlo method combined with the dynamical cluster approximation.