Nonlocal transport and heating in superconductors under dual-bias conditions

TL;DR

This paper investigates nonlocal transport in superconductor hybrid structures under dual bias, revealing large conductance signals caused by heating effects that can mimic Cooper pair splitting, combining experimental and theoretical insights.

Contribution

It provides new understanding of heating-induced nonlocal signals in superconductor hybrids under dual bias, highlighting effects previously attributed to Cooper pair splitting.

Findings

Large nonlocal conductance signals observed

Heating effects dominate under symmetric bias

Heating mimics Cooper pair splitting phenomena

Abstract

We report on an experimental and theoretical study of nonlocal transport in superconductor hybrid structures, where two normal-metal leads are attached to a central superconducting wire. As a function of voltage bias applied to both normal-metal electrodes, we find surprisingly large nonlocal conductance signals, almost of the same magnitude as the local conductance. We demonstrate that these signals are the result of strong heating of the superconducting wire, and that under symmetric bias conditions, heating mimics the effect of Cooper pair splitting.