Non-local Andreev reflection through Andreev molecular states in graphene Josephson junctions

TL;DR

This paper proposes a graphene-based device with stacked Josephson junctions that enables non-local Cooper pair splitting via hybridized Andreev states, potentially simplifying experimental implementation.

Contribution

It introduces a novel device design using stacked graphene Josephson junctions to achieve non-local Andreev reflection without precise control of parameters.

Findings

Non-local Andreev reflection can dominate conductance in the proposed setup.

Device does not require precise control of junction length, doping, or phase difference.

Potential for experimental realization of Cooper pair splitting in graphene structures.

Abstract

We propose that a device composed of two vertically stacked monolayer graphene Josephson junctions can be used for Cooper pair splitting. The hybridization of the Andreev bound states of the two Josephson junction can facilitate non-local transport in this normal-superconductor hybrid structure, which we study by calculating the non-local differential conductance. Assuming that one of the graphene layers is electron and the other is hole doped, we find that the non-local Andreev reflection can dominate the differential conductance of the system. Our setup does not require the precise control of junction length, doping, or superconducting phase difference, which could be an important advantage for experimental realization.