Current-biased Andreev interferometer

TL;DR

This paper theoretically analyzes a three-electrode Andreev interferometer under current bias, revealing features like hysteresis, negative magnetoresistance, and flux-sensitive voltage modulation, enhancing device sensitivity.

Contribution

It introduces a theoretical framework for understanding current-biased Andreev interferometers with new insights into their hysteretic behavior and flux modulation capabilities.

Findings

Identification of hysteretic and non-hysteretic regimes

Prediction of negative magnetoresistance effects

Demonstration of flux-dependent voltage modulation

Abstract

We theoretically investigate the behavior of Andreev interferometers with three superconducting electrodes in the current-biased regime. Our analysis allows to predict a number of interesting features of such devices, such as both hysteretic and non-hysteretic behavior, negative magnetoresistance and two different sets of singularities of the differential resistance at subgap voltages. In the non-hysteretic regime we find a pronounced voltage modulation with the magnetic flux which can be used for improving sensitivity of Andreev interferometers.