Inter-node superconductivity in strained Weyl semimetals

TL;DR

This paper investigates how strain-induced pseudomagnetic fields influence inter-node spin-triplet superconductivity in Weyl semimetals, revealing that certain spin alignments are energetically favored and affect current properties.

Contribution

It introduces a quasiclassical framework to analyze the impact of pseudomagnetic fields on superconducting states in Weyl semimetals, highlighting the stability of specific spin configurations.

Findings

Spin-parallel Cooper pairs have the lowest energy.

Superconducting gap remains unaffected by pseudomagnetic field strength.

Chiral currents are suppressed in certain spin configurations.

Abstract

The effects of a strain-induced pseudomagnetic field on inter-node spin-triplet superconducting states in Weyl semimetals are studied by using the quasiclassical Eilenberger formalism. It is found that the Cooper pairing with spins parallel to the pseudomagnetic field has the lowest energy among the spin-triplet states and its gap does not depend on the strength of the field. In such a state, both electric and chiral superconducting currents are absent. This is in contrast to the superconducting states with the spins of Cooper pairs normal to the field, which support a nonzero chiral current and are inhibited by the strain-induced pseudomagnetic field. The corresponding critical value of the field, which separates the normal and superconducting phases, is estimated.