Pure crossed Andreev reflection assisted transverse valley currents in $\alpha-\mathcal{T}_3$ lattices

TL;DR

This paper introduces a new method leveraging pure crossed Andreev reflection in superconducting hybrid junctions with $ ext{alpha-} ext{T}_3$ lattices to generate highly efficient transverse valley currents with potential for valleytronic applications.

Contribution

It presents a novel approach for generating transverse valley currents using pCAR in $ ext{alpha-} ext{T}_3$ lattice-based superconducting junctions, achieving high valley Hall angles.

Findings

Transverse valley currents can be generated with zero net charge.

The valley Hall angle can reach an order of unity.

The method offers high efficiency for valleytronic devices.

Abstract

We propose a novel method for the generation of the transverse valley currents, which is based on the pure crossed Andreev reflection (pCAR) in the superconducting hybrid junctions composed of the gapped $\alpha-\mathcal{T}_3$ lattices with ferromagnet-induced exchange interaction. The angle-resolved pCAR probability is asymmetric for a given valley, resulting in the transverse valley currents with zero net charge. This pCAR assisted charge-valley conversion is highly efficient with the valley Hall angle reaching an order of unity, suggesting potential applications for valleytronic devices.