A Ballistic Graphene Cooper Pair Splitter

TL;DR

This paper presents an experimental study of Cooper pair splitting in a ballistic graphene multiterminal junction, demonstrating tunable electronic transport and clear signatures of pair splitting, modeled successfully with advanced theoretical frameworks.

Contribution

It introduces a novel graphene-based multiterminal device demonstrating controlled Cooper pair splitting in the ballistic regime, with comprehensive experimental and theoretical analysis.

Findings

Clear signatures of Cooper pair splitting observed

Transport in one junction tunable by bias in another

Experimental data well described by advanced models

Abstract

We report an experimental study of Cooper pair splitting in an encapsulated graphene based multiterminal junction in the ballistic transport regime. Our device consists of two transverse junctions, namely the superconductor/graphene/superconductor and the normal metal/graphene/normal metal junctions. In this case, the electronic transport through one junction can be tuned by an applied bias along the other. We observe clear signatures of Cooper pair splitting in the local as well as nonlocal electronic transport measurements. Our experimental data can be very well described by using a modified Octavio-Tinkham-Blonder-Klapwijk model and a three-terminal beam splitter model.