Robust and Symmetric Magnetic Field Dependency of Superconducting Diode Effect in Asymmetric Dirac Semimetal SQUIDs

TL;DR

This paper reports a robust and symmetric superconducting diode effect in asymmetric SQUIDs made from Dirac semimetal Cd3As2, showing independence from magnetic field strength and polarity, likely due to helical spin textures.

Contribution

It demonstrates a stable, symmetric-in-field superconducting diode effect in Dirac semimetal SQUIDs, a novel finding in superconducting electronics.

Findings

Zero magnetic field SDE observed.

SDE independent of magnetic field strength and polarity.

Likely caused by helical spin textures in Dirac semimetals.

Abstract

The recent demonstration of the superconducting diode effect (SDE) has generated renewed interests in superconducting electronics in which devices such as compact superconducting diodes that can perform signal rectification where low-energy operations are needed. In this article, we present our results of robust and symmetric-in-magnetic-field SDE in asymmetric superconducting quantum interference devices (SQUIDs) realized in high-quality Dirac semimetal Cd3As2 thin film grown by the molecular beam epitaxy (MBE) technique. Consistent with previous work, a zero magnetic field SDE is observed. Furthermore, the difference in switching current is independent of the strength and polarity of an out-plane magnetic field in the range of -10 mT and 10 mT. We speculate that this robust symmetric-in-field SDE in our Dirac semimetal SQUIDs is due to the formation of helical spin texture, theoretically predicted in Dirac semimetals.