$p$-wave magnet driven field-free Josephson diode effect

TL;DR

This paper demonstrates a novel Josephson diode effect in a junction with a $p$-wave magnet and an altermagnet barrier, requiring minimal conditions and no Rashba SOC, promising for quantum technology applications.

Contribution

It introduces a new Josephson diode effect in a $p$-wave magnet-based junction without needing Rashba spin-orbit coupling or different superconductors.

Findings

The JDE is robust over a broad parameter range.

The effect relies on mirror symmetry $M_{yz}$ as a key constraint.

No Rashba SOC or different superconductors are needed.

Abstract

Recently, the superconducting diode effect (SDE), characterized by unequal critical currents in opposite directions, has been observed experimentally and predicted theoretically in models of bulk superconductors and Josephson junctions (JJs). In this work, we construct a Josephson junction using a recently discovered unconventional coplanar magnet, the $p$-wave magnet (PM), with proximity-induced superconductivity, and demonstrate the emergence of a Josephson diode effect (JDE). The barrier region is formed by another unconventional collinear magnet, namely an altermagnet (AM). We illustrate that apart from time-reversal and inversion symmetries, the mirror operation $M_{yz}$ emerges as the key symmetry constraint. Also, unlike earlier models that realize the JDE using unconventional magnets, this setup does not require Rashba spin-orbit coupling (SOC) or different superconductors across the junction. Moreover, we demonstrate that the realization of the JDE in this framework requires only minimal conditions while maintaining high performance. The effect remains robust across a broad parameter regime, and thus making the system particularly promising for applications in quantum circuits and computing technologies.