Andreev drag effect via magnetic quasiparticle focusing in normal-superconductor nanojunctions

TL;DR

This paper investigates a novel hybrid normal-superconductor pi-junction where magnetic quasiparticle focusing significantly enhances non-local current, which oscillates with magnetic field, offering tunability and new insights into quantum transport.

Contribution

It introduces a new NS pi-junction design demonstrating greatly enhanced non-local current and magnetic field tunability, advancing understanding of hybrid quantum transport phenomena.

Findings

Non-local current can be much larger than in previous systems.

Non-local current oscillates with magnetic field, enabling tunability.

Classical dynamics qualitatively explain the observed effects.

Abstract

We study a new hybrid normal-superconductor (NS) pi-junction in which the non-local current can be orders of magnitude larger than that in earlier proposed systems. We calculate the electronic transport of this NS hybrid when an external magnetic field is applied. It is shown that the non-local current exhibits oscillations as a function of the magnetic field, making the effect tunable with the field. The underlying classical dynamics is qualitatively discussed.