# Influence of a chiral chemical potential on Weyl hybrid junctions

## TL;DR

This paper investigates how a chiral chemical potential affects transport and superconducting properties in Weyl semimetal-superconductor junctions, revealing spin-polarized Cooper pairs and angle-dependent conductance.

## Contribution

It introduces the impact of chiral chemical potential on transport and pairing in Weyl semimetal junctions, highlighting spin polarization effects.

## Key findings

- Chiral chemical potential influences differential conductance.
- Induces spin polarization of Cooper pairs.
- Transport properties depend on junction orientation.

## Abstract

We study the transport properties and superconducting proximity effect in NSN junctions formed by a time-reversal symmetry broken Weyl semimetal (WSM) in proximity to an $s$-wave superconductor. We find that the differential conductance and induced pairing amplitudes strongly depend on the angle between the junction direction in real space and the axis separating the Weyl nodes in momentum space. We identify the influence of a chiral chemical potential, i.e., the electron population imbalance between Weyl nodes of opposite chirality, on the transport characteristics of the junction. Remarkably, we observe a net spin polarization of Cooper pairs that are generated via Andreev reflection in the two WSM regions. The spin polarization is opposite in the two WSM regions and highly sensitive to the chirality imbalance and excitation energy.