Electrically controlled crossed Andreev reflection in two-dimensional antiferromagnets

TL;DR

This paper demonstrates tunable crossed Andreev reflection in a superconductor with two-dimensional antiferromagnetic layers, controllable via gate voltages, with potential applications in quantum entanglement.

Contribution

It predicts a robust, electrically controlled perfect CAR signature in 2D antiferromagnetic heterostructures, advancing quantum entanglement technologies.

Findings

Perfect CAR observed with electron and hole doping

CAR signal is electrically tunable and robust over voltage range

Potential for solid-state quantum entanglement applications

Abstract

We report tunable crossed Andreev reflection (CAR) in a superconductor sandwiched between two antiferromagnetic layers. We consider recent examples of two-dimensional magnets with hexagonal lattices, where gate voltages control the carrier type and density, and predict a robust signature of perfect CAR in the nonlocal differential conductance with one electron-doped and one hole-doped antiferromagnetic lead. The magnetic field-free and spin-degenerate CAR signal is electrically controlled and visible over a large voltage range, showing promise for solid-state quantum entanglement applications.